File tools that stay on your device
Convert HEIC and WebP, shrink photos to an exact size, merge and split PDFs. It all runs in this tab, so nothing is uploaded.
Supported formats and tasks: HEIC, JPG, PNG, WebP, AVIF, PDF, Merge, Split, Compress, Cron.
Image tools
Convert HEIC, WebP, AVIF, PNG and JPG, or compress a photo to an exact size limit.
- HEIC to JPGConvert iPhone HEIC photos to JPG in your browser.
- HEIC to PNGConvert HEIC photos to lossless PNG in your browser, in batches.
- Image converterConvert HEIC, WebP, AVIF, PNG and JPG images to JPG, PNG or WebP in your browser.
- WebP to PNGConvert WebP images to PNG in your browser, with transparency kept.
- WebP to JPGConvert WebP images to JPG in your browser.
- PNG to WebPConvert PNG to WebP in your browser and cut file size while keeping transparency.
- JPG to WebPConvert JPG photos to WebP in your browser for faster web pages.
- AVIF to JPGConvert AVIF images to JPG without uploading them.
- AVIF to PNGConvert AVIF images to PNG in your browser, keeping transparency.
- PNG to JPGConvert PNG screenshots and images to smaller JPGs in your browser.
- JPG to PNGConvert JPG images to PNG in your browser when a form or app requires PNG.
- Compress imageCompress JPG, PNG, WebP and HEIC images to an exact size limit like 100 KB, or by quality.
- Compress to 100 KBReduce a JPG, PNG or HEIC photo to under 100 KB in your browser, at the best quality that fits.
- Compress to 50 KBReduce a photo to under 50 KB for application and exam forms, at the best quality that fits.
- Compress to 20 KBShrink a photo or scanned signature to under 20 KB for online applications.
PDF tools
Merge, split and rearrange pages without uploading the file.
Developer tools
Small utilities for everyday ops work.
Guides
What happens to your files when you convert or compress them, measured on real photos.
- HEIC vs JPG: what you actually lose when you convert iPhone photosWe measured it: a JPG at quality 92 is 7–54% bigger than the iPhone HEIC with near-zero visible loss. What you do lose, and how to convert on Windows, Mac and iPhone.
- How to compress a photo to under 100 KB for online forms (without it looking awful)Resize first, then lower quality. A worked example with measured sizes shows why 1,000–1,200 px is the sweet spot for 100 KB, plus settings for 50 KB and 20 KB.
Privacy
Files never leave your device
- 0 bytes uploaded
- Images and PDFs are decoded and written by code running in this tab. Open your network panel while a file converts: nothing leaves.
- No account, no watermark
- Use every tool as often as you like. Output files are yours, unmarked.
- Loads only what it needs
- The HEIC decoder and the PDF engine download only on their own pages, so everything else stays fast.
Questions
Short answers. Anything else: contact@cuelark.com.
- Are these tools really free?
- Yes. No sign-up, no watermark, no daily limit and no ads.
- Do you upload my files?
- No. The image and PDF tools read and process files inside your browser tab; nothing is sent to a server. The cron tool also runs entirely in the page.
- Who makes Cuelark Tools?
- The Cuelark Team, who also make Cuelark UI and build custom AI software at cuelark.com. Suggestions and bug reports go to contact@cuelark.com.