PDF, images, QR codes, units, text and colors — convert anything instantly. Everything runs in your browser. Your files never leave your device.
Split, merge, compress, rotate, reorder, delete pages, convert images to PDF and more.
Convert between JPG, PNG, WEBP, GIF and HEIC. Compress, resize and optimize images.
Generate QR codes for URLs, text, WiFi and more. Customize colors and download as PNG or SVG.
Convert length, weight, temperature, speed, area, volume and data storage units instantly.
Word counter, case converter, Lorem Ipsum generator, remove duplicates, Base64 encode and more.
Convert HEX, RGB, HSL colors. Generate palettes, check contrast ratios and create gradients.
Files stay on your device
No server processing
No subscriptions ever
Open and use immediately
Desktop, tablet, mobile
Unlike most online converter tools, OneConvert processes everything locally in your browser using JavaScript. Your files are never uploaded to any server. What you work with stays with you — completely private by design.
Split PDFs into individual pages, merge multiple files, compress for email, rotate pages, reorder, delete and convert between formats. All 9 PDF tools run instantly in your browser with no file size limits and no registration required.
Convert JPG to PNG, PNG to WebP, HEIC to JPG and more — instantly. Compress images to reduce file size, resize by pixel or percentage, and batch process multiple files at once. iPhone HEIC photos are converted on-the-fly.
Convert between metric and imperial units instantly. Length, weight, temperature, speed, area, volume and data storage — all in one clean interface with a full reference table showing all values simultaneously.
Most online converter tools upload your files to a server, process them remotely, and then delete them — they say. OneConvert works differently: every single operation runs directly in your browser using JavaScript. When you select a PDF to split, it is read into your browser's memory. When you convert an image, the Canvas API handles it locally. No data is transmitted. Your files stay on your device from start to finish.
Many popular converter tools are free up to a point — then hit you with daily limits, file size caps, or a paywall for basic features. OneConvert has none of those. There is no account to create, no subscription tier, no limit on how many files you can process or how large they are. The only constraint is your browser's available memory, which on a modern device is several gigabytes.
OneConvert covers the conversions and edits that come up regularly — splitting a PDF to share one section, compressing an image before uploading it, generating a QR code for a link, converting between CSS units while building a website, or checking whether two colours have sufficient contrast for accessibility. Thirty tools across six categories, each with its own URL and focused functionality.
Because everything runs in the browser, OneConvert works on Windows, macOS, Linux, iOS and Android without installing anything. The interface adapts to any screen size. PDF processing uses pdf-lib and pdf.js. Image conversion uses the Canvas API. QR generation uses qrcode.js. These are well-tested, widely used JavaScript libraries — not experimental code.