Priconvert

Image compression

Compress images online, privately in your browser

Reduce JPG, PNG, WEBP, and AVIF file size without uploading. Adjust quality, optionally resize, and keep or change the output format — all processed locally on your device.

Compression re-encodes your image. File size usually drops for lossy formats, but not always — especially for PNG. Priconvert never claims savings when the output is larger.

Compress your image
Reduce file size locally in your browser. Not every file becomes smaller — results depend on format, quality, and dimensions.
Loading usage…Local processing

Conversion mode

Single is free for quick one-off jobs. Batch converts many images to a ZIP — Pro workflow, processed locally in your browser.

Compression preset

Presets set quality and optional size caps. Custom unlocks the slider and exact dimensions.

Noticeable savings for most photos while staying sharp.

Output format

Re-encoding may remove embedded metadata and color profiles.

Drop your image here

JPG, PNG, WEBP, or AVIF. Drag and drop, or choose a file.

Supports jpg, jpeg, png, webp, avif

Privacy: images stay on your device. Priconvert does not upload your files for compression.

About this tool

How image compression works here

Image compression reduces how many bytes an image file uses so it is easier to upload, email, or host on a website. Priconvert compresses JPG, PNG, WEBP, and AVIF locally in your browser — your file is not uploaded for compression. You choose a preset or custom quality, optionally resize, and can keep the original format or switch to another.

Compression is a trade-off. Lossy formats (JPG, WEBP, AVIF) can usually get smaller when you lower quality. PNG is different: the browser has no meaningful PNG quality slider, so same-format PNG “compression” often fails to shrink the file. When that happens, the tool says so clearly instead of pretending you saved space.

Lossy versus lossless

Lossy compression (JPG, typical WEBP/AVIF exports) discards some visual detail to save bytes. Lossless compression keeps every pixel exactly — PNG export in browsers is lossless, which is why re-saving a PNG often fails to shrink it. This tool labels results honestly either way.

JPG, PNG, WEBP, and AVIF

  • JPG is universal and compresses photos well with a quality slider, but it cannot store transparency.
  • PNG keeps sharp edges and transparency, but browser re-encoding rarely shrinks PNG much. Resize or convert to WEBP/AVIF for better savings.
  • WEBP often beats JPG on size at similar quality and can keep transparency for static images.
  • AVIF can be even more efficient. Encoding uses a local WASM module on first use (cached for the session). Animated AVIF is not supported.

Quality, dimensions, and file size

Lower quality usually means a smaller lossy file. Reducing width and height multiplies savings because there are fewer pixels to store. Strong prioritizes file size — images larger than 2048 px on the long edge may also be resized. Custom lets you set exact dimensions while keeping aspect ratio if you want.

Limitations

  • Not every compression run reduces file size — especially same-format PNG.
  • Re-encoding may remove embedded metadata and color profiles.
  • Animated WEBP and animated AVIF are not supported.
  • AVIF output requires the WASM encoder to load successfully.
  • Strong prioritizes file size. Images larger than 2048 px may also be resized.

How it works

A local compression workflow

No upload queue — decode and encode on your device with clear size reporting.

  1. 1

    Choose an image

    Upload a JPG, PNG, WEBP, or static AVIF. Animated WEBP and animated AVIF are rejected.

  2. 2

    Pick a preset or custom settings

    Light, Balanced, and Strong set quality (and Strong may cap very large dimensions). Custom unlocks the quality slider and exact width/height.

  3. 3

    Choose an output format

    Keep the same format, or export to JPG, WEBP, AVIF, or PNG. Transparent images converted to JPG get a white background — you’ll see a warning first.

  4. 4

    Compare and download

    Review original versus compressed size. If the output is larger, try a stronger preset or another format — especially WEBP or AVIF for PNGs.

Privacy

Your images stay on your device

Compression runs in your browser. AVIF encoding may download a public WASM codec once per session — that is the encoder, not your photo.

FAQ

Image compression questions

Honest answers about formats, quality, and what this compressor can do.

Related tools

Related converters and tools

Convert formats, strip metadata, or compress video on the same local pipeline.