Lossless compression preserves decoded image data, while lossy compression discards information to reduce bytes. Choose from the image's purpose, format, transparency, text detail, delivery size, and the visible artifacts in a real before-and-after comparison.

What current primary sources establish

  • MDN: Image file type and format guide: Compares JPEG, PNG, WebP, and AVIF, including transparency and compression tradeoffs.
  • Apple: Using HEIF or HEVC media: Explains when Apple devices preserve HEIF and when sharing may convert it to a more compatible format.

Recommended workflow

  • Decide whether the problem is excess pixels, an unsuitable format, encoder settings, metadata, or a destination byte limit.
  • Keep the source and export controlled variants from it, recording format, dimensions, quality, encoder, bytes, and date.
  • Compare the variants at 100 percent and in the final placement for blur, ringing, banding, blocking, color shifts, and alpha damage.
  • Choose the smallest acceptable derivative and avoid recompressing an already optimized delivery copy.
  • Keep the comparison fixture and settings so the result can be reproduced when the encoder, browser, or destination changes.

Choose the next action

  • Resize first when the image has many more pixels than the destination can display.
  • Compress without resizing when dimensions are correct but the byte size is too high.
  • Change format only when transparency, compatibility, animation, or delivery efficiency justifies it.

Decision boundary

The receiving platform's current rule is authoritative. Avoid universal byte targets and do not sacrifice text, damage evidence, or identity-photo detail merely to achieve a dramatic compression percentage.

Final quality checks

  • Read the current upload rule at the destination and leave reasonable byte headroom.
  • Compare the output with the original at 100% zoom, especially text and evidence details.
  • Keep originals and upload early enough to recover from a rejection.

Common mistakes to avoid

  • Using an old social-media dimensions chart instead of the current platform help page.
  • Compressing before choosing the correct aspect ratio and pixel dimensions.
  • Removing too much detail merely to reach an arbitrary round byte target.
  • Failing to inspect the uploaded crop and re-encoded result.

Where LoveMyFile fits

Use the LoveMyFile image compressor for the bounded task described here. Keep any authoritative source or original when applicable, inspect the output, and use the official destination or an approved specialist system for requirements outside that task.

Sources and review date

Sources below were reviewed on September 2, 2026. Reopen time-sensitive requirements, limits, prices, policies, and interfaces before acting.

This article provides technical and editorial guidance. It is not legal, medical, tax, immigration, or compliance advice.