myriadfile

Image converter

One converter for every common image format: HEIC, HEIF, WebP, AVIF, PNG, JPG, GIF and BMP in; JPG, PNG, WebP, AVIF or PDF out. Processed on your device.

Runs on your device. Nothing is uploaded.
RunsIn your browser
UploadsNone
CollectionImage tools
Drop any images hereHEIC, WebP, AVIF, PNG, JPG, GIF, BMP. Batches welcome.or paste with Ctrl V / ⌘ V

Good to know
  • AVIF output appears only in browsers that can encode AVIF. WebP output is unavailable in a few older Safari versions.
  • Converted files contain no EXIF metadata, so location and camera details are removed. Rotation is applied to the pixels.
  • GIF input uses the first frame only. Multi-image HEIC files (bursts) use the first image.
  • Very large batches are converted one file at a time to keep memory use low.

Choosing an output format

Every format has a job. JPG is the universal choice for photos. PNG is lossless and keeps transparency, best for screenshots, logos and graphics. WebP gives smaller files for websites, with or without transparency. AVIF is more efficient still, but output is only available in browsers that can encode it. PDF puts one or more images into a document for forms and printing.

This general converter remembers the output format you used last, so it is handy if you convert the same kind of file regularly.

How to use the image converter tool

  1. Add images. Mix formats freely. Each file is detected by its content, not just its extension.
  2. Pick an output format. The options under Convert to change to match the format.
  3. Adjust size and quality. Optional: a quality level, a KB limit, or a maximum width and height.
  4. Download. Each file has its own download, or use Download all (ZIP).

Settings explained

Convert to
JPG, PNG, WebP and PDF are always available. AVIF appears only if your browser can encode it.
Quality
Applies to JPG, WebP, AVIF and the images inside a PDF.
PDF page size
Same as image, A4 or US Letter. A4 and Letter fit the image with a margin.

Formats at a glance

FormatBest forTransparency
JPGPhotos, maximum compatibilityNo
PNGScreenshots, logos, editingYes
WebPWebsitesYes
AVIFSmallest web imagesYes
HEICiPhone camera storagePossible, rarely used

Detected by content

Phones and websites sometimes give files the wrong extension, such as a WebP saved as .jpg. Myriadfile reads the first bytes of each file to identify the real format before decoding.

Troubleshooting

A file shows an error
It may be damaged, password-protected, or a format your browser cannot decode (for example AVIF in an outdated browser). Other files in the batch still convert.
AVIF is not in the menu
Your browser cannot encode AVIF. You can still convert AVIF files to other formats.

Frequently asked questions

Which formats can I convert from?

HEIC, HEIF, WebP, AVIF, PNG, JPG, GIF (first frame) and BMP.

Is it really free?

Yes, with no limits, sign-up or watermark. Ads keep the site running.

Do files leave my computer?

No. All decoding and encoding happens in your browser.

Can it work offline?

Yes. After the page has loaded once and shows “Works offline”, it runs without an internet connection.

Are converted images watermarked?

Never.

Sources