Image processing that stays on your own device
widantoo is a fully client-side online image toolbox that runs 100% in your browser — format conversion, compression, editing, privacy redaction, and camera RAW developing all happen on your device. Images are never uploaded, stored, or tracked. Free, no watermark, no sign-up, no usage limits.
widantoo is a complete image toolbox that runs inside your browser — not yet another "upload it, then download it back" online service. From basic format conversion, compression, and resizing to EXIF privacy removal, redaction, and camera RAW developing, every operation runs locally using the browser's built-in Canvas, WebAssembly, and Web Workers. You can even disconnect from the internet and keep working. Your images never leave your computer.
We Set Out to Build a Different Kind of Image Site
A toolbox, not an upload site
Most "online image tools" send your images to their servers for processing. Even when they claim to be "secure" or to "delete automatically", you have no way to verify it. widantoo flips this around: all computation goes into your browser, so the image is never even transmitted — privacy doesn't rest on a promise, it's simply technically impossible for us to sneak your files away.
Do one small thing cleanly
We're not chasing an all-in-one "design platform". We focus on doing the everyday task of image processing fast, cleanly, and trustworthily: open and use, batch processing, local zip download — no ads, no account wall, no watermarks, no limits.
Real depth, no thin pages
Every tool comes with real use cases, pitfall tips, and format knowledge — not just a lone conversion box. We also maintain a structured image format knowledge base to help you genuinely understand how to choose between HEIC, WebP, and AVIF.
What widantoo Can Do
Six tool categories covering the common needs of image processing
All-Format Conversion
Convert freely between PNG, JPG, WebP, AVIF, BMP, JPEG XL, and SVG; supports HEIC (Apple photos) as a source. Batch convert and download as a zip.
Compression & Sizing
Smart compression (including PNG palette reduction), compress-to-target-KB, resize, and crop — meeting upload limits and speeding up the web.
Privacy & Security Tools
EXIF / GPS removal, metadata viewing, redacting sensitive info, duplicate finding, and watermark removal — keep your privacy in your own hands.
Camera RAW Developing
Develop CR2, NEF, ARW, DNG and other camera RAW files to JPG locally in the browser — a genuine need very few tools handle.
Generators & Dev Tools
Favicon generation, image ↔ Base64 conversion, and other handy utilities for webmasters and developers.
Format Knowledge Base
In-depth explanations, comparisons, and selection advice for each image format — not just tools, but understanding.
How "Local Processing" Actually Works
The browser is the processing engine
Modern browsers ship powerful image capabilities: Canvas handles encoding, decoding, and drawing; WebAssembly runs high-performance algorithms like AVIF / JPEG XL / PNG quantization; Web Workers move heavy computation to background threads without freezing the UI. widantoo assembles these into a complete toolbox — no server is involved in the computation.
Verifiable by going offline
Because nothing depends on a server, you can disconnect from the internet after the page loads and every tool keeps working — the most direct proof that "images are not uploaded". The site is also a PWA you can "install" to your desktop or home screen for offline use.
No tracking, no monetization
We don't integrate third-party ads or behavioral analytics, we don't build account systems, and we don't monetize your images or usage data in any way.
Our Promise
- 100% in-browser processing — images never uploaded or stored
- Free forever — no watermark, no sign-up, no usage limits
- Bilingual (EN / 中文), responsive across desktop / tablet / mobile
- New tools shipped continuously, each with use cases and knowledge
- Upload your images to any server
- Integrate third-party ads or behavioral tracking
- Put up an account wall, sell memberships, or monetize your data
- Pile up thin tool pages with no unique value
Start Here
Frequently Asked Questions
Completely free. No membership, no usage caps, no watermark, and no account required — just open the page and use every feature.
No. All processing runs locally in your browser; images are never uploaded, stored, or transmitted. You can disconnect from the internet after loading the page and verify — every tool keeps working.
Local processing needs no server compute, so running costs are minimal. More importantly, it's the privacy promise we care about most — the image isn't even transmitted, so privacy rests on technology rather than a pledge.
Conversion between PNG, JPG, WebP, AVIF, BMP, JPEG XL, and SVG; HEIC (Apple photos) as a source; and camera RAW developing for CR2 / NEF / ARW / DNG and more.
Yes. widantoo develops CR2, NEF, ARW, DNG and other camera RAW files into JPG locally in the browser — a capability many online tools don't offer.
Yes. widantoo is a PWA (Progressive Web App) you can "install" to your desktop or home screen; once loaded online, it works offline.
Only language and conversion settings are saved locally on your device (localStorage), never uploaded. You can clear them anytime on the "Clear Cache" page.