Overview
All Tools
204 tools, grouped by category. Everything runs directly in your browser — no uploads, no account, no tracking.
PDF Tools
10- Add Page Numbers to PDF Add page numbers to a PDF in your browser — position, format and font size on a picker, your file stays local.
- JPG to PDF Converter The portal demands a PDF, you have three JPGs on your phone. Let's stitch them together.
- PDF Compressor Your email provider says: 'Attachment too large (Max 25 MB)'. Annoying.
- PDF Merger Cover letter, resume, and references—HR wants one PDF, not five attachments.
- PDF Password Remover You know the password for your payslip, you just don't want to type it every time.
- PDF Splitter The accountant only needs pages 4 to 7. Don't send them the 100-page manual.
- PDF to JPG Converter The upload form only accepts images, but you only have a PDF.
- Reorder PDF Pages Reorder PDF pages by drag-and-drop — entirely in your browser, your file never leaves your device.
- Rotate PDF Rotate PDF pages in your browser — your file never leaves your device.
- Sign PDF online Draw your signature, drag it onto the right page, download the signed PDF. Your file never leaves your browser.
Markdown Converters
09- CSV Cleaner Mojibake umlauts, semicolon vs comma, decimal commas — fixed in one pass, fully on-device.
- CSV to Markdown Converts CSV and TSV into Markdown pipe tables — with delimiter auto-detection, locally in the browser.
- DOCX to Markdown Converts Word documents to Markdown — headings, lists, tables, bold and italic preserved.
- HTML to Markdown Converts HTML files or pasted snippets into Markdown — with sanitize pass and GFM output.
- Markdown to DOCX Generates structured DOCX from markdown — headings as real Word style refs, not bold text.
- Markdown to HTML Turns markdown into HTML — body fragment for your CMS or standalone file with embedded styles.
- Markdown to PDF Generates PDF from markdown via the browser print path — vector output, embedded fonts, no server.
- PDF to Markdown Converts PDFs to Markdown — text layer directly, scanned pages via OCR. All in your browser tab.
- XLSX to Markdown Converts XLSX, XLS and ODS to Markdown pipe tables — multi-sheet, auto-header, locally in the browser.
Images
28- AI Image Description Drop a photo, get a finished alt text. A specialized neural network describes your image — entirely on your device, never on a server.
- AI Image Detector Is it a real photo or Midjourney? Let's find out.
- AI Image Upscaler Small pixels in, double-edge pixels out. A neural network invents the missing detail — on your device, never on a server.
- Attention Heatmap Drop an image, get a heatmap. A specialised neural network predicts which spots pull the most attention in the first seconds — right on your device, with no upload.
- Convert JPG to AVIF AV1 is the most modern photo codec. AVIF brings it to your hero images.
- Convert JPG to WebP Lighthouse complains. WebP brings the LCP image into line.
- Convert PNG to AVIF AVIF beats PNG on file size — and keeps the alpha channel.
- Convert PNG to WebP PNG is large. WebP is small. Transparency stays.
- Convert WebP to PNG or JPG Some app refuses to open your WebP. Turn it into PNG or JPG.
- Depth Map from Photo Drop a photo, get a depth map. A specialized neural network estimates per-pixel depth from a single image — no stereo camera needed, entirely on your device.
- EXIF Viewer See what your photos actually carry — camera, lens, GPS coordinates, capture time, all as a searchable tree.
- Favicon Generator Drop a logo, pick a PWA mask shape, extract a theme-color — and download the full favicon set plus HTML snippet as a ZIP, without the file ever leaving the browser tab.
- Find Duplicate Photos Photo library full? Drop your images in — the tool groups exact and similar photos, suggests one to keep per group, and shows how much space you reclaim. Everything stays on your device.
- HEIC to JPG Converter Apple loves HEIC. The upload form for your new job hates it.
- HEIC to PNG Converter Convert HEIC to PNG—when every single pixel counts.
- Image Diff The filenames are identical. Are the images?
- Image Format Converter Which image format fits? Compare, convert, ship.
- Image Resizer Pixel-precise resizing instead of awkward cropping — your originals never leave the device.
- Image to Text A client sent a screenshot of an error message instead of copying the text.
- JPG Compressor Pick a quality, see the difference, download the smaller file — all inside your browser.
- Photo to Coloring Page Turn your photo into a printable coloring page. No upload, no account, no tracking.
- PNG Compressor Pick lossless or lossy, see the difference, download the smaller file — transparency stays.
- QR Code Generator Nobody is going to type a 50-character URL from your flyer into their phone.
- Remove Image Background Cut out the person, trash the background. The AI runs on your device, not our servers.
- Remove Metadata Detects EXIF, GPS, author and XMP in JPG, PNG, WebP and PDF — and removes them on demand.
- Segment Anything Click, drag a box, or add multiple refinement points — a specialized segmentation model finds the object contour and delivers mask, cutout, and inverse mask as lossless PNGs.
- SVG Optimizer Editor exports balloon SVGs with comments, metadata, and 60-digit decimals. We strip the noise without rewriting your art.
- SVG to PNG Pick a pixel size, set the background behaviour, drop any number of files — everything stays inside your browser tab.
Video
09- Blur Video Background You don't need to redecorate the room behind you — just blur it.
- Compress Video Smaller, faster, private — right in your browser.
- Convert Video Format Convert everything, upload nothing — right in your browser.
- HEVC to H.264 Converter Your iPhone video plays as a black screen on your TV. Let's fix that.
- Remove Video Background You recorded a flawless presentation, but your messy bedroom is in the background.
- Video Object Detection Upload your video, pick the classes you care about, and get exportable bounding boxes with timestamps — all local, no server upload.
- Video to Audio Converter Pull the audio track from any video, right in your browser.
- Video Trimmer Find the right slice, watch it back, export it — without anyone else seeing your video.
- Webcam Background Blur The video call starts in 3 minutes, and you haven't cleaned your room.
Audio
06- Audio Silence Remover Drag-and-drop, three sliders, a waveform with silent regions highlighted in warm tint, and a WAV export with no server upload. Built for podcasters, voice memos, and language practice.
- Audio Transcription Hours of audio, zero typing — your browser does the listening.
- Audio Trimmer Find the right slice, hear it back, export it — without anyone else seeing your file.
- Fast English Transcription English audio, faster than real-time — without a single second leaving your device.
- Speech Enhancer Your podcast guest was sitting in a café. Let's filter out the noise.
- Text to Speech Written text as spoken voice — instantly, in your browser, no account required.
Text
11- AI Text Detector Does this text sound too smooth? Check if ChatGPT wrote it.
- Case Converter Type some text — every one of twelve cases appears below in real time, with proper AP/Chicago title case and smart acronym tokenisation.
- Character Counter 'Maximum 500 characters including spaces.' Let's see if you made the cut.
- Flesch Reading Ease How readable is your text — really? Four readability formulas, a CEFR level and a plain-language traffic light, all running in your browser without uploading a single word.
- Lorem Ipsum Generator The mockup is due at 5 PM. The copywriter hasn't replied to your Slack.
- Morse Code Translator One dot, one dash, a gap — a whole language. Works both ways, plays the audio, teaches you the code.
- NATO Phonetic Alphabet Alfa, Bravo, Charlie — or Anton, Berta, Cäsar? Spell names and codes clearly over the phone. With audio, a printable A4 card and a quiz, all in your browser.
- Roman Numeral Converter Is Super Bowl LVIII 58 or 57? Let's figure this out.
- Text Diff Tool Someone edited the document, but nobody turned on Track Changes.
- Word Counter Type or paste your text — words, characters, reading time and AI tokens update letter by letter.
- Word Unscrambler Enter your letters and find possible words by length, score and filter.
Color
03- Color Picker OKLCH picker with P3 gamut warning. WCAG and APCA against light and dark side by side. EyeDropper, image pick, deuteranopia preview and code snippets in one pure-client tool.
- Hex to RGB Color Converter The designer sent you a hex code, but your framework demands RGB.
- WCAG Contrast Checker Light grey text on a white background looks sleek, but nobody can read it.
CSS Generators
07- Box-Shadow Generator One layer feels flat. Three stacked layers behave like real light.
- CSS Animation Builder Hover works. Focus directs attention. Entrances don't disrupt. Animation does that — when you build it well.
- CSS Gradient Generator The designer knows the effect. The code shows why OKLCH rescues the muddy middle.
- CSS Grid Generator Subgrid aligns card headers without JavaScript. Container queries respond to container width, not viewport. Together they make layouts that hold up in 2026.
- CSS Shadow Generator Box, text and drop in one workbench. Contrast gate against unreadable halos. light-dark() instead of hex compromise.
- Flexbox Playground Switch flex-direction to column and everything flips. The axis overlay shows why.
- Text-Shadow Generator text-shadow only — but deep: neon, 3D, letterpress, neo-brutalism. Five-size stage. Halo gate against unreadable glows.
Code Formatters
06- CSS Formatter, Beautifier & Minifier You inherited a 3,000-line minified CSS file and need to change the primary button color.
- JSON Diff It works on localhost, but breaks in production. Let's compare the JSON payloads.
- JSON Formatter & Validator Online The API returned 3 megabytes of unformatted JSON on a single line.
- Regex Tester The email validator broke production. You need to know why.
- SQL Formatter & Beautifier Someone sent you a 200-line SQL string with no line breaks. Let's make it readable.
- XML Formatter & Beautifier You just received a 5-megabyte XML dump from a legacy SOAP API. Good luck reading that.
Data Converters
06- Base64 Encoder and Decoder Online The API wants a Base64 auth string. Please don't paste your password on a random server.
- CSV to JSON Comma or semicolon, period or comma, BOM or no BOM — four standards, one converter. The leading zero in a postal code survives because the column stays a string instead of a number.
- JSON to CSV Converter Your boss wants the API data in Excel, but you only have nested JSON arrays.
- TOML to JSON Four TOML datetime types that other converters flatten into strings stay intact here. Comments survive as JSON5. Cargo manifests and pyproject.toml files get non-blocking sanity checks.
- URL Encoder & Decoder The link is broken because someone put a space in the query parameter.
- YAML to JSON The `NO` trap from YAML 1.1 is visible. Anchors and merge keys are visualised. Kubernetes, Compose, GitHub Actions and Helm files get profile-specific hints instead of generic errors.
Passwords & Hashing
11- AES Encryption A cipher whose plaintext never leaves your browser. Sounds obvious. It isn’t.
- Caesar Cipher Three letters forward in the alphabet — that was Caesar's whole secret. Here you crack it in seconds and see exactly how the math behind it works.
- File Hash Checker Generate a hash, verify against an expected value, or compare two files — all in the browser, even for files over 2 GB.
- Hash Generator Generate cryptographic hashes instantly in your browser.
- htpasswd Generator Password hashes for Apache and nginx — bcrypt with cost-12 default, webserver toggle against wrong algorithm choice, batch mode for whole teams.
- JWT Decoder The API returned a 401 Unauthorized. Is the token expired or missing the admin role?
- Nano-ID Generator Seven alphabet presets, five use-case recipes, length slider 8–64, bulk-generate up to 10 000 — plus a Birthday-Paradox collision calculator in the same UI.
- Random Number Generator One number between 1 and 100 — or six out of 49, no duplicates, sorted, rolled in your browser.
- ROT13/ROT47 Decode spoilers, read geocaching hints, practise classroom cryptography — all three classic ciphers in a single-page view.
- Secure Password Generator IT requires '1 uppercase, 1 symbol, 12 characters'. Just click generate.
- UUID Generator The database needs 50 unique keys for test data. You can't just type 'id1' 50 times.
Meta Tags & SEO
06- Clean Tracking URL You share a link. Three marketing systems want to listen in. We cut them out.
- Meta Tag Generator Title, description, Open Graph, Twitter Card, Schema.org JSON-LD, and hreflang — four framework outputs (HTML, JSX, Astro, Svelte) with a four-way live preview.
- OpenGraph Generator Compose tags visually, check per-platform limits live, render an OG image in the browser, and emit Schema.org Article JSON-LD from the same tab — everything in-page, no upload, no account.
- robots.txt Generator Compose user-agent stacks visually, block AI bots cleanly or allow them as a citation source — with a validator catching the typical foot-guns (case mismatch, deprecated tokens, blocked CSS/JS).
- SEO Title Checker Write a title, count pixels, never get truncated in the SERP — all in one tab.
- UTM Link Builder Three people tag the same newsletter, three sources show up in GA4. We fix that.
Server & DevOps
07- .htaccess Generator Compose rules visually, see module dependencies, export for Apache 2.4 and Cloudflare Pages from the same list. With an HSTS preload checklist built in.
- Cron Expression Builder Four dialects, one editor. Timezone next-run preview included. DST no longer disappears silently.
- gitignore Generator Multiple stacks, one file. 2026 templates maintained first-party. Diff mode, source attribution and a .gitattributes companion built in.
- HTTP Status Codes RFC standard and platform codes in one tool — with confusion cards for the four most common traps and code snippets for six languages.
- Internet Speed Test Download, upload, ping, bufferbloat – plus a plain-language translation of what those numbers actually mean for your day.
- MIME Type Finder Bidirectional lookup, in-browser magic-byte detection, and snippet export for five server stacks — all local, no file upload.
- nginx Config Generator Compose server blocks visually, pick a TLS profile, switch on HTTP/3 and WebSocket — or paste an existing .htaccess and convert it to nginx directives automatically.
AI & LLM
02Finance
24- Amortization Calculator You pay $2,500 a month for your mortgage. The bank is keeping $1,800.
- Car Lease Payment Calculator The dealer says $399 a month. The 'money factor' says you're getting ripped off.
- Cash Discount Calculator Ignoring a '2/10 Net 30' invoice discount is like taking a loan at 36% interest.
- Cash Flow Calculator for Business The P&L shows a profit, but the bank account is empty. Where's the cash?
- Compound Interest Calculator You invest $500 a month. But is the money actually working for you?
- Discount Calculator An extra 20% off clearance doesn't mean 70% off. Let's do the actual math.
- German Child Support Calculator An expat father in Munich, freshly separated, needs a real number before the family-court mediation — without his salary touching a CRM.
- German Commuter Allowance Calc Reform 2026 from km 1. See what you can really deduct.
- German Compulsory Share Calculator An expat heir wants to know what's left of the German Pflichtteil after the new partner inherited the family home — before paying an attorney €350 for a 15-minute answer.
- German Parental Allowance Calculator An expat couple, expecting in March, want a real answer in euros — not a portal that asks for tax-ID first.
- German Pension Deferral Calculator for Age 70 A Germany-specific retirement-age model: monthly deferral bonus, extra pension points and break-even in one browser-only calculator.
- German Real Estate Transfer Tax Calculator 2026 Buying a German home for €500,000. The taxman charges €17,500 in Bavaria, €32,500 in North Rhine-Westphalia.
- German Vehicle Tax Calculator Three drivetrains, one tax bill. See what you would actually owe.
- Hourly Wage to Annual Salary Calculator The offer is $35 an hour. Is that enough to pay your rent?
- Inheritance & Estate Tax Calculator 2026 You inherited the family home. The government wants its cut — in cash.
- Interest Calculator Your savings account pays 4%. Inflation is 3%. You're barely breaking even.
- Loan Payment Calculator The dealer offers 6% financing. How much is that actually costing you?
- P/E Ratio Calculator The stock is $150. Is it a bargain or a massive bubble?
- Paycheck Calculator 2026 You negotiated $100k. Your paycheck says $5,800. Where did the rest go?
- Receipt Price Tracker Two stores, one product, one quiet green outline for the better price.
- ROI Calculator You spent $5,000 on Facebook ads and made $6,000. Was that actually worth it?
- Sales Tax & VAT Calculator The price tag says $99. Your credit card says $106.87. Welcome to US sales tax.
- SEO ROI Calculator Conservative, realistic, and optimistic side by side. With AI Overview adjustment and an honest ranking ramp.
- US Mortgage Calculator Principal, interest, taxes, insurance, PMI and HOA in one breakdown — plus affordability, refinance break-even and amortization on a single page.
Math
01Construction & Renovation
17- Concrete Calculator Multi-element volume, strength-class suggest, mix ratio and ready-mix threshold in one step — the concrete calculator that gives you the spec the plant expects.
- Fence Calculator Four material variants in one tool, slope correction for post spacing and depth, WPC privacy strips module for twin-bar mesh, and an A4 material list as PDF.
- Heating Cost Calculator Estimates yearly and monthly heating cost for six fuel classes — with overrideable 2026 defaults, a heat-pump JAZ slider, a CO₂ price trajectory and a transparent assumptions box.
- Insulation Calculator Bidirectional R-Value ↔ U-value, IECC climate-zone check and material smart-suggest in one — the insulation calculator that handles US, UK and DACH together.
- Laminate Calculator Pattern-aware waste, AC rating per use case and dye-lot reminder — the laminate calculator that does the real DIN math.
- Lumber Calculator Six wood species with density lookup, project-specific wastage corridors, DIN 4074-1 mapping, Q1/2026 price corridors and bill-of-materials export — for DIYers and carpenters.
- Masonry Calculator Brick or block count per m² wall area, normal vs. thin-bed mortar volume, multi-wall builder and first-row levelling estimate — the masonry calculator that catches the most common beginner mistakes.
- Mortar Calculator Four mortar types, application surcharge +0/+20/+30 % per LZR, mixing water per sack, and a mortar-group wizard for M5/M10/M15 per DIN EN 998-2.
- Plaster Calculator Six plaster types with datasheet densities, DIN V 18550-1 substrate defaults, mixing water per sack, and an A4 material list as a print-ready PDF.
- Roof Area Calculator Seven roof forms with live cross-section sketches, form-sensitive wastage hints, optional PV output and DIN 18338 measurement toggle for DIY and trades.
- Screed Calculator Pick a screed type, get DIN-correct minimum thickness, drying time per floor finish and underfloor-heating compatibility — works for UK sand-and-cement screed and US self-leveling underlayment alike.
- Staircase Calculator DIN 18065 and ÖNORM B 5371 compliance in one input, three step rules on a tolerance band, DIN 18040 accessible mode, print-ready cut-section PDF at 1:20 / 1:50 / 1:1.
- Tile Calculator Pattern-aware waste, DIN-compliant thinset coverage, and dye-lot reminder — the tile calculator that gives you more than just square feet.
- Vinyl Flooring Calculator Pattern-aware waste, use-case smart-suggest and bidirectional mil-mm wear layer — the LVP / LVT calculator that picks the material with you.
- Wall Paint Calculator Surface factor, color intensity, class recommendation per room and smart-pack picker — the wall paint calculator with real DIN EN 13300 + ASTM D2486 depth.
- Wallpaper Calculator Pattern-repeat-aware drop math, paste recommendation per wallpaper type, and dye-lot reminder — the wallpaper calculator that does the real math.
- Window U-Value Calculator Compute Uw per DIN EN ISO 10077-1 for single-sash, double-sash and balcony-door windows. Includes three-tier GEG / KfW / passive-house compliance check and live glass-versus-frame visualisation.
Time
10- Age Calculator How old am I to the day — and when was Grandma my current age? Both answers without an account, no upload, no leap-year fudging.
- Countdown Timer Four modes in one tool: single, multi, Pomodoro, event. Background-accurate via system clock, live tab-title countdown, Web Audio alarm. Pure-client, survives reload.
- Date Calculator How many days until Christmas? What weekday was 9 November 1989? Three clean modes, ISO 8601-compliant — all entries stay in the browser.
- Days to Hours One day is 24 hours. A week is 168. Four weeks is 672. With decimal and D:HH:MM side by side, sprint plans and shift rosters line up without mental math.
- Hours to Minutes Eight hours of full-time work is 480 minutes. A school lesson runs 45 minutes. With decimal and HH:MM:SS side by side, timesheets and contracts line up without mental math.
- Months to Days Six months of trial period is 183 days. Nine months of pregnancy is 274 days. When you count the days, you know exactly when a deadline lands.
- Time Zone Converter The invite says 2:00 PM EST. When exactly do you need to be on the call?
- Unix Timestamp Converter The API says the event fired at 1698748392. Was that yesterday or 2012?
- Working-Days Calculator How many working days does this period contain in your state? Includes a bridge-day leverage detector and home-office allowance check — every input stays in the browser.
- Years to Days A 30-year mortgage is 10,957 days. A 67-year career is 24,472 days. When you count the days, you plan more precisely.
Length
08- Centimeters to Inches Converter The IKEA desk says it's 120 cm wide. Your measuring tape only speaks inches.
- Feet to Meters Converter The European visa form asks for your height in meters. You only know 5'11".
- Inches to Centimeters Converter The screen is 27 inches. You need to know if it fits on your metric desk.
- Kilometers to Miles Converter The sign says 100 km/h. Here is how to know if that's a ticket.
- Meters to Feet Converter Type meters to get feet, or feet to get meters — both directions, instantly.
- Millimeters to Inches Converter The 3D printer software expects millimeters. Your calipers only read inches.
- Nautical Miles to Kilometers Converter The pilot says you're 500 nautical miles out. Should you order the Uber now?
- Yards to Meters Converter The Olympic pool is 50 meters. How many football yards is that?
Weight
05- Grams to Ounces Converter The European baking recipe calls for 200 grams of flour. Your scale only has ounces.
- Kilograms to Pounds Converter The European airline limits your bag to 23 kg. You need to know if you can pack more shoes.
- Metric Tons to Pounds Converter (t to lbs) The European supplier quotes 5 metric tons of steel. You need to know the freight in pounds.
- Pounds to Kilograms Converter The barbell is in pounds, but your new fitness app expects kilograms.
- Stone to Kilograms Converter Your British friend says they lost 2 stone. Do you congratulate them or call a doctor?
Area
03- Hectares to Acres Converter You bought 2 hectares of land in Europe. How big is that in acres?
- Square Kilometers to Square Miles Converter The documentary says the ice shelf is 5,000 square kilometers. How big is that in Texas-units?
- Square Meters to Square Feet Converter Shopping for a 90 square meter apartment in Europe? Here's what that means.
Volume
03- Cubic meters to cubic feet 1 m³ equals 35.3147 ft³. Easy — until a 40-foot container arrives and nobody knows how many liters it holds.
- Liters to Gallons Converter Your European rental car gets 6 liters per 100km. Is that good?
- Milliliters to Fluid Ounces Converter The recipe calls for 250 ml of milk. You only own an American measuring cup.
Temperature
03Health
03- BMI Calculator BMI with three modes: Adults (WHO), Children 2–17 (Kromeyer-Hauschild) and Seniors 65+ (DGE). Optional waist metrics and athlete pointer. All in the browser, no data storage.
- Dog Age Calculator Is your seven-year-old Labrador really middle-aged, and why do Great Danes age twice as fast as Chihuahuas? Three calculators, one breed database, no account.
- Pregnancy Week Calculator How far along am I? Three inputs (LMP, conception or ultrasound) — gestational age in W+D, trimester, projected due date and post-birth wellness windows.