Frequently Asked Questions

Is AllConvert really free?

Yes. Every converter on this site is free to use with no account, no sign-up and no usage caps imposed by us. The site is supported by advertising.

Are my files uploaded to a server?

No. All conversion work happens locally in your browser using JavaScript. Your file's contents are read on your own device, converted on your own device, and the result is saved from your own device. We never receive, store or even see your files. Some converters load an open-source library (for example a PDF or spreadsheet parser) from a public CDN the first time you use them — that downloads the library code to your browser, but your file content is never sent anywhere.

Is there a file size limit?

There is no hard limit set by the site. Because conversion runs in your browser, the practical limit is your device's memory. Files up to a few hundred megabytes generally work on a desktop computer; very large files may be slow or fail on phones or low-memory devices.

Which browsers are supported?

Any modern browser: Chrome, Edge, Firefox and Safari, on desktop or mobile. One caveat: AVIF output depends on your browser shipping an AVIF encoder, which currently means Chrome-based browsers in most cases. If your browser can't encode a format, AllConvert tells you instead of silently producing a wrong file.

Why did my AVIF conversion fail?

Reading AVIF files works almost everywhere, but creating them requires an encoder built into the browser. If you see "Your browser cannot encode AVIF", try a recent version of Chrome or Edge, or pick WEBP instead — it offers similar compression with much wider support.

Can I convert iPhone HEIC photos?

Yes. Drop a .heic or .heif photo and convert it to JPG, PNG or WEBP. The first HEIC conversion downloads an open-source decoder library (about 1 MB) to your browser; after that it's instant. As with everything else on AllConvert, the photo itself never leaves your device.

What happens to animated GIFs?

Browsers only expose the first frame of a GIF to the conversion canvas, so converting an animated GIF to PNG, JPG or WEBP produces a still image of the first frame. Producing animated output is not currently supported.

Does converting reduce image quality?

It depends on the target format. PNG, BMP and ICO are lossless — pixels are preserved exactly. JPG, WEBP and AVIF are lossy; AllConvert encodes them at 92% quality, which is visually indistinguishable from the original for most photos while still reducing file size. Converting from a lossy format to a lossless one does not restore detail that was already lost.

My XLSX file has several sheets — which one is converted?

The first sheet in the workbook. If you need a different sheet, move it to the first position in your spreadsheet app before converting.

What resolution are the PNG pages from a PDF?

Pages are rendered at 2× scale, roughly 150 DPI for a standard A4/Letter page. That is sharp enough for screens and most documents.

Is the Markdown converter full CommonMark?

It covers the common core: headings, paragraphs, bold, italic, inline code, fenced code blocks, links, images, ordered and unordered lists, blockquotes and horizontal rules. Exotic extensions (tables, footnotes, task lists) are not rendered.

Does the site use cookies?

The converter itself sets no cookies and keeps no history of your files. We display ads served by Google AdSense, and ad vendors may use cookies to serve and measure ads. See the Privacy Policy for details and opt-out links.

I found a bug or a file that won't convert. What should I do?

Please contact us with your browser name and version, the file type, the target format you picked and the exact error message shown on the card. That's usually enough to reproduce and fix the problem.