Image Format Converter

About this tool

Different platforms expect different formats, and launching Photoshop to convert one file is overkill. This tool converts between JPEG, PNG, WebP, and AVIF on our server using Sharp, with a fixed, web-tuned setting for each target: JPEG at quality 90, WebP at quality 85, AVIF at quality 60, and lossless PNG. WebP is selected by default as the safe modern choice, typically around 30% smaller than JPEG; AVIF is usually smaller still and is supported by current Chrome, Safari, and Firefox. After converting you see the original and converted sizes side by side, plus how much smaller or larger the new file is. JPEG has no transparency, so transparent areas of a PNG, WebP or AVIF come out black when converted to JPEG — choose PNG, WebP or AVIF to keep the alpha channel. EXIF metadata including GPS coordinates is stripped as a side effect of re-encoding. Files up to 20 MB are accepted and deleted from the server within seconds. No account, no watermark, no limit on conversions per day.

Why use it

• Four Formats, Tuned Defaults: Each target gets a sensible fixed setting — JPEG at quality 90, WebP at 85, AVIF at 60 and lossless PNG — so you can convert without tuning anything or guessing numbers.

• AVIF for Smaller Hero Images: AVIF usually beats JPEG and WebP on size at similar visual quality, and Chrome, Safari, and Firefox all decode it. For above-the-fold photos where every kilobyte affects Largest Contentful Paint, it is a high-impact format switch.

• Clear Size Feedback: The result shows the original and converted file sizes and states whether the new file is smaller or larger by a percentage, so you know immediately whether the format switch was worth it.

• Keeps Transparency Where Possible: PNG, WebP and AVIF output all carry the alpha channel through, so logos and cut-outs stay transparent. Only JPEG, which has no alpha support, flattens transparent areas.

• Strips EXIF as a Side Effect: Re-encoding through Sharp drops camera GPS, serial numbers, and other EXIF metadata automatically. Convert your format and sanitise metadata in a single upload rather than running two separate tools.

• Files Auto-Deleted After Job: Uploads are processed in a temporary directory and deleted within seconds of the download response. No caching, no analytics pipeline, no object storage. Your files do not persist on any server.

How to use

1. Upload a source image in JPEG, PNG, WebP, or AVIF format (up to 20 MB)
2. Pick the target format from the dropdown: WebP (default), AVIF, JPEG, or PNG
3. Click Convert and wait — AVIF encoding can take a few seconds for large files
4. Compare the Original and Converted sizes and check the preview
5. Click the Download button to save the file with its new extension

When it helps

• When switching site hero images to WebP or AVIF to improve Core Web Vitals and Lighthouse performance scores
• When a CMS, app store, or form rejects an AVIF or WebP file that your phone or design tool produced
• When exporting Figma or Illustrator designs as PNGs and you need JPEG for stakeholder presentations or email
• When a JPEG photo needs to become a PNG for an editor or upload form that only accepts PNG
• When Google Search Console flags slow LCP times and the hero image is still being served as a large JPEG
• When archiving photos from a camera that shoots WebP or AVIF and your archive software only reads JPEG

Examples

Tips

• Use AVIF for hero and OG images where the byte savings directly improve Core Web Vitals; fall back to JPEG with a picture element for older email clients.
• WebP is the safest modern choice — supported by every browser since 2020 and roughly 30% smaller than JPEG at equivalent visual quality.
• Converting a transparent logo to JPEG turns the transparent areas black; keep it as PNG or WebP unless the destination truly requires JPEG.
• AVIF encoding is CPU-intensive; large files may take a few seconds on the server — this is normal and not a sign of failure.
• For screenshots and icons with crisp edges, use PNG rather than JPEG — JPEG's chroma subsampling visibly smudges sharp lines.

Frequently Asked Questions

Glossary

AVIF (AV1 Image File Format)

An image format based on keyframes from the AV1 video codec. It achieves significantly better compression than JPEG and WebP at equivalent visual quality, with support in all major browsers since 2022.

Alpha channel

A per-pixel transparency value stored alongside the colour channels in a PNG or WebP file. JPEG does not support an alpha channel, so transparent areas must be filled with a solid background colour when converting to JPEG.

Lossy vs lossless

Lossy compression permanently discards imperceptible colour information to reduce file size — decoded pixels differ subtly from the source. Lossless compression reorganises data without any information loss, producing bit-identical decoded pixels.

Browser support

The set of browsers that can decode and render a particular image format. WebP has broad support since 2020. AVIF support arrived in 2021–2022. JPEG and PNG have universal support dating back decades.

Chroma subsampling

An encoding optimisation used by JPEG, WebP, and AVIF that stores colour (chroma) at lower resolution than brightness (luma). At 4:2:0 subsampling, colour is stored at one quarter the spatial resolution, which saves bytes but smudges sharp colour boundaries.

Encoder profile

A set of encoding parameters — such as compression level, entropy coding mode, and colour precision — that determine the trade-off between file size, quality, and encoding speed for a given format.