Supported conversions.
57 conversion paths across 8 input and 8 output formats — all processed locally in your browser.
From HEIC
A note on HEIC
HEIC and HEIF files from iPhones and iPads are supported as inputs and are decoded locally in your browser. Exporting to HEIC is intentionally not offered: there is no reliable patent-safe HEVC encoder available to web pages, so choose WEBP or AVIF for equally small, widely supported results.
How image conversion works
Every format on this page stores pixels differently. PNG keeps every pixel exactly through lossless compression and supports transparency, which makes it the safe home for logos and screenshots. JPEG throws away detail the eye rarely notices to make photographs small. WEBP and AVIF push compression further with modern encoders while keeping transparency, and TIFF and BMP trade file size for the raw fidelity that print and legacy software demand.
A conversion decodes the source file into raw pixels, then re-encodes those pixels using the target format's rules. That is why the quality slider appears for lossy targets like JPEG, WEBP, and AVIF — you are choosing how much information the encoder may discard — and why lossless targets like PNG and TIFF never ask. Because the whole pipeline runs in your browser tab, the decode, the encode, and the download all happen without a single byte leaving your device.
Pairs differ in more than compression. Converting to ICO bundles multiple square sizes into one icon file for favicons; converting from HEIC unwraps iPhone photos into formats Windows, Android, and the web understand; converting between modern formats like WEBP and AVIF is usually about balancing file size against how many older systems can open the result. Each conversion page below explains its specific trade-offs — pick the pair you need, or read the format comparison guide first if you are unsure which target to choose.
Frequently asked questions
Which image formats can I convert?+
ConvertKit reads PNG, JPEG, WEBP, HEIC, AVIF, BMP, GIF, and TIFF, and can export PNG, JPEG, WEBP, AVIF, BMP, GIF, TIFF, and ICO. That is every supported input-output combination listed on this page — HEIC is input-only because browsers cannot reliably encode HEVC, so choose WEBP or AVIF when you need small output files.
Are the conversions done on a server?+
No. Every conversion runs in your browser tab using the Canvas API and WebAssembly codecs. Your images are read from your device, decoded and encoded in memory, and written back to your device — no file ever crosses the network, which keeps private, client, and unreleased material fully private.
Is there a limit on batch size or file size?+
You can queue up to 20 files at once, each up to 25 MB. Batches convert in a single pass and download as a ZIP, or you can save results individually from the preview. There is no account, no watermark, and no daily usage cap.
Which format should I convert to?+
For photographs destined for the web, convert to WEBP (or AVIF for maximum compression) at quality 85–90. For logos, screenshots, and graphics with transparency, use PNG. For universal compatibility with email clients, print labs, and older software, use JPEG. Our format guide covers the trade-offs in detail.