All tools (newest first)
Every tool, ordered from the most recently added.
194 tools
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September 21, 20261 tools
September 20, 20266 tools
- 3D Wind TunnelBetaFly a 3D model from Mach 0 to 20 and measure its drag, lift and shock wave
- Lens Ray TracingBetaFollow each ray to see where a convex or concave lens forms its image
- Nuclear Chain ReactionBetaFire one neutron and find the edge of the critical mass
- Maxwell's DemonBetaSort a gas hot and cold by working a single door
- Magnus EffectBetaFly a spinning ball beside a spinless one and see how far it bends
- Kármán Vortex Street Wind TunnelBetaMake wires sing with wind vortices and calm a swaying chimney
September 19, 202617 tools
- Galilean CannonBetaStack balls and drop them to launch the top one many times higher
- Chladni PlateBetaWatch sand gather on a vibrating plate's nodal lines to draw Chladni figures
- Pendulum WaveBetaWatch pendulums of tuned lengths weave snake waves and then line up again
- Langton's AntBetaWatch simple ant rules turn chaos into highways and multi-color turmite patterns
- Mandelbrot ExplorerBetaZoom endlessly into the Mandelbrot set and click to explore its Julia sets
- Wildfire SimulatorBetaDefend a village from wildfires with water drops and firebreaks
- Sandpile ModelBetaPile up sand grains and watch power-law avalanches grow a fractal
- Smoke Fluid SimulatorBetaDrag to stir colorful smoke in a real-time stable-fluids simulation
- Lorenz AttractorBetaWatch thousands of particles trace the chaotic Lorenz butterfly in 3D
- Phantom Traffic JamBetaSee how one car's brake tap turns into a backward-moving phantom jam
- Quantum Tunneling LabBetaWatch a wave packet reflect and tunnel through barriers in real time
- Magnetic Pendulum ChaosBetaFractal chaos map of where a pendulum over three magnets lands
- Galton BoardBetaWatch thousands of balls pile up into a normal curve on a Galton board
- Double-Slit LabBetaReal-time double-slit interference from the wave equation
- Gas Molecule SimulatorBetaWatch thousands of colliding molecules settle into the Maxwell–Boltzmann distribution
- N-Body Gravity SandboxBetaFling planets, watch them orbit, collide and merge under gravity
- Cloth Tearing SimulatorBetaPull, rip and blow a pinned Verlet cloth in the wind
September 18, 20268 tools
- Game of LifeBetaDraw cells, swap rules and explore Conway's Game of Life
- Turing Pattern LabBetaWatch two reacting chemicals paint Turing patterns on their own
- Falling SandBetaPour sand, water, fire and lava and watch them react
- Flocking LabBetaWatch bird flocks and fish schools emerge from just three rules
- Magnet Phase Transition LabBetaTune the temperature and watch magnetic domains form and melt
- Wave Interference StudioBetaColor each wave source and explore interference, diffraction and refraction
- Double Pendulum SimulatorBetaWatch hundreds of nearly identical pendulums diverge into chaos
- Bouncy Ball PlaygroundBetaPour, fling and explode thousands of balls
September 17, 20261 tools
September 15, 202627 tools
- PDF Action Pipeline (Batch Recipes)Chain PDF operations into a reusable recipe
- Embed Missing Fonts in PDFReplace unembedded standard fonts with embedded Noto Sans
- PDF to Braille (BRF)Convert text PDFs into a braille BRF file
- PDF Overprint Simulation & Transparency PreviewCheck overprint and transparency risks before printing
- Create PDF Article ThreadsCreate article threads that follow stories across columns
- Edit PDF TagsMove, create and edit the accessibility tag tree
- Fix Low-Confidence OCR WordsFix OCR words under 80% confidence beside their source crops
- Export PDF to SVGExport vector lines, glyph paths and images as per-page SVGs
- Pixelate or Blur PDFPixelate or blur faces and plates, destroying data beneath
- Batch PDF Image Alt TextReview every image as a thumbnail and fill in missing alt text at once
- Remove Hidden PDF TextStrip misread or duplicated invisible OCR text layers
- Fix PDF HairlinesThicken hairlines that drop out in print
- Set PDF Page LabelsSet roman, arabic or prefixed page labels by section
- Fix Garbled PDF TextFix text that copies as gibberish or boxes
- Manage PDF LayersView PDF layers (OCG) and toggle default visibility
- PDF to EPUBConvert text PDFs into a reflowable EPUB/HTML ebook
- PDF to Slides GIFTurn PDF pages into a page-flipping animated GIF
- PDF Contact SheetTurn PDF pages into a thumbnail grid contact sheet
- PDF to Long ImageStitch PDF pages vertically into one long PNG/JPEG
- Repair PDFRebuild damaged or truncated PDFs so they open again
- PDF Info Viewer, Size, Font & Print Preflight CheckPDF info, size, fonts, image resolution and print preflight
- Set PDF Open ViewSet start page, zoom, two-page view, bookmarks panel or full screen on open
- PDF Accessibility CheckerPDF/UA basics report: tags, alt text, language, reading order, contrast
- Edit PDF MetadataView and edit title, author, subject, keywords, creation date and XMP metadata
- Extract PDF Links & Add LinksExport PDF links to CSV or make URLs and page references clickable
- Extract PDF Comments & Remove CommentsExport PDF comments or remove them selectively
- Edit PDF Bookmarks & Auto-Generate Table of ContentsEdit bookmarks, auto-create them or add a TOC page
September 14, 202624 tools
- Add Text to PDF, Annotate & SignWrite on a PDF, annotate, proofread or add a signature
- Watermark PDF, Stamps & Confidential MarksAdd watermarks, stamps or confidential marks to a PDF
- Add Page Numbers to PDF, Headers & FootersPage numbers, headers, footers and Bates numbers for PDFs
- Attach Files to PDF & Extract AttachmentsEmbed files in a PDF or extract its attachments
- Measure PDF DrawingsMeasure distance, perimeter and area on scaled PDF drawings
- Add QR Codes & Barcodes to PDF in BulkStamp QR codes, barcodes and serials from CSV on each page
- Compare PDFs & Overlay DrawingsCompare text and drawings between two PDFs
- Convert PDF to PDF/A or PDF/XConvert to PDF/A (archive) or PDF/X (print) and verify
- Create PDF Form & Detect Fields AutomaticallyCreate fillable PDF forms, detect fields, add calculations
- Fill PDF Form, Reset & Import Form DataFill, reset, import or export PDF form data
- Flatten PDFMerge annotations, forms and transparency into pages
- Grayscale PDF & Convert PDF to CMYKGrayscale, CMYK, K100 and spot color conversion
- Compress PDFShrink PDFs by downsampling images and merging duplicates
- Add Crop Marks to PDFAdd crop marks, bleed and color bars for print
- PDF Poster TilingPrint a large poster across several A4 sheets
- Enhance Scanned PDF, Deskew & Clean UpEnhance, deskew, despeckle and auto-orient scanned PDFs
- Extract Text from PDFExtract text to TXT or Markdown in correct column order
- Extract Tables from PDFDetect PDF tables, fix cells and save as CSV or XLSX
- PDF OCR Text LayerAdd a searchable, copyable invisible OCR text layer to scanned PDFs
- Digitally Sign PDFSign with a PFX/P12 certificate and verify existing signatures
- Sanitize PDF MetadataStrip author, XMP, photo EXIF, scripts and earlier revisions
- Unlock PDFRemove the open password and print, copy and edit restrictions
- Password Protect PDFSet an open password and print or copy permissions with AES-256
- Redact PDFFind personal data by area or pattern and truly remove it
September 13, 20265 tools
- Outline PDF TextConvert text to vector outlines that need no fonts
- Edit PDF TextChange printed text and redraw it with a built-in font
- Remove PDF BackgroundRemove backgrounds, watermarks and scan specks
- Replace Image in PDFSwap embedded images, keeping position and size
- Extract Images from PDFSave embedded images as PNG or JPEG at full quality
September 11, 20266 tools
- Make PDF BookletArrange a PDF as a fold-and-staple booklet
- N-up PDFPut 2, 4 or 8 pages on each sheet
- Crop PDF, Add Margins & Resize to A4Crop, add margins, resize to A4 or add bleed
- Reorder PDF Pages, Delete & RotateReorder, delete, rotate and insert PDF pages
- Split PDF by Range, Bookmarks, Text or Blank PagesSplit by range, size, bookmarks, text or separator pages
- Merge PDFCombine several PDFs into one, in any order
September 8, 20263 tools
September 7, 20262 tools
September 5, 202631 tools
- World ClockTap cities on a world map to compare their time and offset
- Body Fat CalculatorEstimate body fat percentage by circumference or BMI
- Meta Tag Generator & Open Graph PreviewGenerate meta tags and preview social share cards
- Image to ASCII Art ConverterConvert a photo into ASCII art, downloadable as TXT or PNG
- Blood Alcohol CalculatorEstimate blood alcohol concentration and time until sober
- .gitignore GeneratorBuild a .gitignore from languages, frameworks, and OS/editors
- Data URI ConverterConvert files to a Base64 data URI and back
- Meme Caption GeneratorAdd draggable top and bottom captions to make a meme
- Pixelate & Blur ToolPixelate or blur faces, license plates, and other regions
- Tip CalculatorSplit a bill and tip evenly among any number of people
- Aspect Ratio CalculatorFind the simplest ratio and solve for a missing dimension
- Barcode GeneratorGenerate Code128, EAN-13, and UPC-A barcodes as SVG or PNG
- CIDR Calculator & Subnet VLSM VisualizerCIDR, netmask and host range plus VLSM subnet visualizer
- Image CropperCrop, rotate, and flip photos with aspect ratio presets
- JSON to CSV Converter, YAML & TSVConvert JSON↔CSV, JSON↔YAML/TOML and CSV↔TSV
- Slug GeneratorTurn a title into a URL-safe slug, with Korean romanization
- Password GeneratorGenerate secure passwords: random, pronounceable, or passphrase
- Case ConverterConvert text to camelCase, snake_case, kebab-case, and more
- Server Time CheckerShow any website's server time live, down to the millisecond
- Color Contrast CheckerCheck contrast ratio and WCAG AA/AAA pass for two colors
- Roman Numeral ConverterConvert between Arabic numbers and Roman numerals
- Percentage CalculatorFour percentage calculations: ratio, change, and discounts
- VAT CalculatorEnter any of net, tax, or gross and get the other two
- Korea Severance Pay CalculatorKorean severance pay and retirement tax from average wage
- Savings & Deposit Calculator, Compound InterestDeposit and savings payouts plus compound growth
- Korea Salary Take-Home Pay Calculator & Hourly WageKorean take-home pay, hourly wage and freelancer gross-up
- Loan CalculatorMonthly payment and amortization schedule by repayment type
- Age CalculatorCompare international, year, and Korean age from a birth date
- Date Calculator & Business DaysD-Day, date difference, date math and business days
- Stopwatch, Countdown Timer & PomodoroStopwatch, countdown timer and Pomodoro in one place
- Currency ConverterConvert 34 currencies with live rates, cached for offline use
September 4, 202621 tools
- Unit ConverterConvert units across 10 categories: length, weight, temperature, and more
- Speaker & Earphone Balance + Frequency Sweep TestTest speaker/earphone L/R balance and run a frequency sweep
- Keyboard TesterLight up keys as you press them to spot dead or stuck keys
- Dead Pixel & Backlight Bleed TestFull-screen colors and patterns to spot dead pixels and backlight bleed
- SVG Path Visualizer & Curve InspectorVisualize an SVG path's d attribute and break down every command
- Resistor Color Code CalculatorResistance, tolerance, and temp coefficient from color bands
- LED Resistor CalculatorCurrent-limiting resistor value, standard value, and color code for LEDs
- Due Date CalculatorDue date and gestational week from your LMP or conception date
- Calorie CalculatorBMR, TDEE, and target calories with a macro split
- BMI CalculatorGet your BMI, weight category, and ideal weight
- Random Name GeneratorGenerate realistic names and nicknames by country
- Regex Tester & BuilderBetaTest and explain regex, or build one from blocks
- Chmod CalculatorGet the chmod octal, symbolic notation, and command from checkboxes
- Photo Metadata Viewer & EXIF RemoverView and strip a photo's EXIF and GPS metadata
- Night Pharmacy FinderFind pharmacies open now, plus late-night and weekend ones, on a map
- Hospital & Clinic FinderFind hospitals and clinics near you by department, hours, and ER
- Emergency Room FinderCheck real-time ER bed availability near you on a map
- AED FinderFind the nearest AED on a map for cardiac emergencies
- Korea Specialty Street FinderSearch Korea's designated specialty streets by region or name
- JSON Data GeneratorGenerate bulk fake JSON records from your field definitions
- API Response Mock GeneratorGenerate mock API response JSON from your fields and response shape
September 3, 20265 tools
- Public Restroom FinderFind public restrooms near you on a map
- SNS Embed Code GeneratorGet embed code from an X, Facebook, Instagram, or Threads URL
- Video CompressorCompress video in your browser: quality, lossless, or audio removal
- SVG Sprite OptimizerOptimize SVGs and package them into a symbol sprite or CSS
- Pulley & Gear Ratio CalculatorSpeed and torque ratios for pulleys and gears, with a diagram
September 2, 202636 tools
- Special SymbolsSearch and copy 9,000+ characters: emoticons, arrows, math symbols
- JSON FormatterPretty-print or minify JSON and pinpoint syntax errors
- UUID GeneratorGenerate UUID v4 values with one click, in bulk
- QR Code GeneratorBuild and style QR codes from Wi-Fi, contact, and other presets
- Image WatermarkAdd a text or logo watermark anywhere on your image
- Video to GIF ConverterTurn a video into a GIF with meme captions
- Image PDF ConverterCombine images into a PDF or extract PDF pages as images
- Equation SolverSolve degree 1–4 equations with step-by-step working
- SQL FormatterBeautify SQL queries or minify them to one line
- Cron Expression Parser & Crontab BuilderExplain cron expressions or build a crontab
- CSS Unit ConverterConvert between px, rem, em, and % based on font size
- Color ConverterConvert colors between HEX, RGB, and HSL with a live preview
- Unix Timestamp ConverterConvert Unix timestamps to dates and back instantly
- ISO 8601 Date ConverterConvert between ISO 8601, Unix timestamps, and local time
- UTF-8 Byte ViewerSee the UTF-8 bytes and Unicode code point of every character
- Unicode Escape ConverterConvert text to \u0041-style Unicode escapes and back
- JWT DecoderDecode JWT headers and payloads, with algorithm and expiry
- Bcrypt Hash GeneratorHash and verify passwords or text with bcrypt
- Base32 Encoder/DecoderEncode text to Base32 and decode it back
- Word Cloud GeneratorPaste text to create a word cloud sized by word frequency
- Lorem Ipsum GeneratorGenerate Latin, Korean, or Japanese placeholder text
- Hash Generator, HMAC & File ChecksumText hashes, HMAC and file checksum verification
- URL Encoder/DecoderPercent-encode or decode URLs and query strings
- Text DiffCompare two texts and see added, removed, and changed lines
- Spell CheckerCheck English or Spanish spelling against a real dictionary
- Markdown Preview, HTML Converter & Syntax GuideMarkdown preview, Markdown ↔ HTML conversion and syntax guide
- Duplicate Line Remover, Text Sorter & Whitespace CleanerRemove duplicates, sort lines, clean spaces and line breaks
- Word CounterCount characters, words, and lines in real time
- HTML Entity Encoder/DecoderEncode special characters to HTML entities and back
- Base64 Encoder/DecoderEncode text to Base64 and decode it back
- Image Compressor & ResizerCompress and resize JPG, PNG and WebP images
- Color PickerClick any pixel in an image to grab its HEX, RGB, and HSL
- Image ConverterConvert images between PNG, JPG, WebP, AVIF, ICO, and more
- Hex ConverterConvert between hex, decimal, and binary instantly
- Prime Factorization CalculatorInstantly factor large integers into their prime factors
- Calculator & Scientific CalculatorSimple and scientific calculator in one place