Free online tools that run in your browser
48 fast, private utilities for developers and everyday tasks. No sign-up, no uploads, no daily limits.
Image & PDF
- Compress Image to a Target Size in KB Compress JPG, PNG, WebP, HEIC, AVIF or TIFF images to a set size such as 50 or 100 KB, or by quality. Lossy PNG, batch and ZIP. Runs in your browser.
- Crop Image to a Circle (Transparent PNG) Crop an image into a circle or rounded square online. Drag and zoom to frame it, add a border or background, and save a PNG, WebP or JPG. No upload.
- HEIC to JPG Converter: iPhone Photos to JPG Convert iPhone HEIC photos to JPG, PNG or WebP in your browser. Batch convert, set the quality, keep or remove EXIF data and download a ZIP. No upload.
- Image Converter: JPG, PNG, WebP, AVIF, ICO Convert images to JPG, PNG, WebP, AVIF, GIF, TIFF, BMP or ICO in your browser. Batch convert with quality, resize and background options, then get a ZIP.
- Image to PDF: Convert JPG, PNG, HEIC to PDF Image to PDF converter for JPG, PNG, HEIC, WebP, TIFF and SVG files. Reorder pages, set page size, margins, fit or fill and compression. No upload.
- Merge PDF Files and Organize Pages Combine PDF files into one in your browser. Reorder, rotate and delete pages, extract or split pages, and unlock protected PDFs. Nothing is uploaded.
- Remove EXIF Data: Photo Metadata Remover Remove EXIF data and GPS location from JPEG, PNG, WebP, HEIC, AVIF, TIFF and GIF photos without recompressing them. See what each reveals. No upload.
- Resize Image: by Pixels, Percent or KB Resize images by pixels, percentage or to a file size in KB. Batch resize to a ZIP, crop or pad to exact sizes. JPG, PNG, WebP, HEIC. No upload.
- SVG to PNG Converter: Any Size or DPI Convert SVG to PNG, JPG or WebP at any size, scale or DPI. Paste SVG code or open files, keep transparency or add a background. Runs in your browser.
- Signature Generator: Draw or Type Online Draw, type or photograph your signature and download a transparent PNG or SVG. Five script fonts, background removal for photos. Nothing is uploaded.
Text
- AI Text Cleaner: Remove Em Dashes Remove em dashes, curly quotes, Markdown marks and hidden characters from ChatGPT and other AI text. See every change with counts, then copy clean text.
- AI Token Counter and GPT Tokenizer Free token counter for GPT-5, GPT-4o and GPT-4: exact o200k and cl100k counts, a view of how your text splits into tokens, and Claude and Gemini estimates.
- Case Converter: Title Case, camelCase & More Case converter for UPPER, lower, Sentence case and Title Case in AP, Chicago, APA or MLA style, plus camelCase, snake_case, kebab-case and more.
- Markdown to PDF Converter Convert Markdown to PDF with a live preview. Tables, task lists, code highlighting, footnotes and LaTeX math, with ChatGPT output supported. Private.
- Markdown to Word (DOCX) Converter Convert Markdown to a Word .docx file with real headings, lists, tables, footnotes and equations, or copy it as rich text for Google Docs. Private.
- Morse Code Translator with Audio Morse code translator: text to Morse and Morse to text, with audio at any WPM, Farnsworth spacing, a flashing light and WAV download. ITU standard.
- Text Compare: Online Diff Checker Compare two texts or files and see every difference by line, word or character. Compare JSON with sorted keys, then save a .diff patch or HTML report.
- Word Counter and Readability Checker Count words, characters, sentences and reading time, check Flesch readability and keyword density, or open a .docx, .odt or .txt file. Free and private.
Developer
- Chmod Calculator: Octal, Symbolic & umask Convert Linux file permissions between 755 and rwxr-xr-x, get chmod commands, work out umask defaults and explain pasted ls -l lines, setuid and ACLs.
- Cron Expression Generator & Explainer Build or paste cron schedules for crontab, Kubernetes, GitHub Actions, AWS, Quartz or Spring, and see them in plain English with the next run times.
- JWT Decoder, Verifier & Token Generator Decode JWTs, check exp and iat, verify HS256, RS256, ES256 or EdDSA signatures with a secret, PEM key or JWKS, and sign test tokens, all in your browser.
- UUID Generator: v4, v7, v5, ULID & NanoID Generate UUIDs (v4, v7, v1, v6 and name-based v3, v5, v8), ULIDs and NanoIDs in bulk, and decode any UUID or ULID to see its version and timestamp.
Calculators
- Final Grade Calculator: What Do I Need? Find the score you need on your final exam to reach a target grade, from your current grade and the final's weight or points, with a table for each letter.
- Grade Calculator (Weighted Average) Weighted grade calculator. Enter scores with weights or points to get your current average and letter grade, even when the weights don't add up to 100.
- Hours Calculator: Work Hours Between Times Calculate hours worked between two times, minus unpaid breaks, with overnight shifts. Get hours and minutes, decimal hours, a total of all rows and pay.
- Time Card Calculator with Overtime Weekly or bi-weekly time card calculator. Enter in and out times and breaks to get daily and weekly hours, overtime over 40 hours, pay, CSV and print.
Date & Time
- Discord Timestamp Generator Make Discord timestamps that show in every reader's own time zone. Pick a date or a countdown, preview each format live and copy the code in one click.
- Unix Timestamp Converter (Epoch Time) Convert Unix epoch timestamps to dates and back, plus Windows FILETIME, .NET ticks, Excel serial dates, GPS time, Julian Day and more formats.
- What Week Is It? ISO Week Number Today See today's ISO 8601 week number, find the week of any date, and list every week of a year as a table, CSV or calendar file. US week numbers included.
Device Tests
- Dead Pixel Test: Check Your Screen Online Find dead, stuck and hot pixels with full-screen solid colours, then check backlight bleed and uniformity with gradients and a checkerboard.
- Gamepad Tester: Test Your Controller Online Test your game controller online with live buttons, analog triggers, stick drift and circularity, a deadzone view, vibration and update rate checks.
- Keyboard Tester: Test Every Key Online Test every key on your keyboard online, in ANSI, ISO, TKL, 75%, 60% and Mac layouts, with key codes, a rollover test and key chatter detection.
- Mic Test: Check Your Microphone Online Test your microphone online with a live level meter and waveform. Check peak dBFS, switch mics, and record a short clip to hear how you sound.
- Webcam Test: Check Your Camera Online Test your webcam online with a live preview, real resolution and measured FPS, a check of supported resolutions, test clips and PNG snapshots.
- What Browser Am I Using? Browser Test See which browser, version and operating system you are using, with your user agent, client hints, live feature tests and fingerprint signals.
- What Is My Screen Resolution? See your screen resolution in physical and CSS pixels, plus live viewport size, device pixel ratio, refresh rate, colour depth and HDR support.
Audio
- Online Guitar Tuner & Chromatic Tuner Tune guitar, bass, ukulele or violin with your microphone. Chromatic tuner with a cents needle, alternate tunings, A4 calibration and reference tones.
- Speaker & Headphone Test: Left/Right Check left and right speakers or headphones, stereo panning, phase and bass with a 20 Hz to 20 kHz sweep. No voice clips, and a WAV test track to download.
- Tone Generator: Online Frequency Generator Play sine, square, sawtooth or triangle tones from 1 Hz to 22 kHz, sweep frequencies, make binaural beats and download the tone as a WAV file.
Generators
- Barcode Generator (EAN, UPC, Code 128) Make EAN-13, UPC-A, UPC-E, Code 128, GS1-128, Code 39, Code 93, ITF-14, Codabar and MSI barcodes with check digits. SVG, PNG or a bulk ZIP.
- Free Invoice Generator (PDF, No Sign-Up) Create a professional invoice in your browser with items, discounts, taxes and any currency. Download a PDF, save an editable copy, no sign-up needed.
- Passphrase Generator (Diceware, EFF Lists) Generate strong, memorable Diceware passphrases from the EFF long or short word lists with your browser's secure random generator. See entropy instantly.
- QR Code Generator (Free, Never Expires) Make static QR codes for links, text, email, phone, SMS, vCard contacts, map locations and events. Add a logo, pick colours, download PNG or SVG.
- WiFi QR Code Generator Make a QR code that joins your Wi-Fi in one scan, with your colours and a logo. WPA/WPA2/WPA3, WEP, open or hidden networks. PNG, SVG or print cards.
Security & Network
- Hash Generator: SHA-256, SHA-3, BLAKE3, MD5 Hash text or files with MD5, SHA-1, SHA-2, SHA-3, Keccak-256, BLAKE2, BLAKE3, RIPEMD-160 or CRC-32, make HMACs, and check files against checksums.
- IP Subnet Calculator (IPv4 & IPv6 CIDR) Calculate IPv4 and IPv6 subnets: network, range, netmask, hosts and address type. Split networks, convert IP ranges to CIDR and summarize route lists.
- Password Strength Checker (Private, Offline) Test how strong a password really is with zxcvbn. See its score, guesses needed, crack times and the patterns that weaken it. Nothing is sent or stored.
Maps & Coordinates
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Why these tools?
Private by design. Every tool runs as JavaScript in your own browser. Text, photos, and files are never uploaded, which also makes them safe for work documents and personal images.
Fast and free. Pages are small and load quickly, keep working if your connection drops after they load, and have no sign-up, watermarks, file-size paywalls, or daily limits.
Explained, not just computed. Each tool comes with a short guide to the standard behind it, from ISO week numbers to EXIF metadata, so you can trust the result.