Filemivo
PNG to JPGConvert PNG images to compact JPG files locally.→JPG to PNGConvert JPG images to lossless PNG files locally.→PNG to WebPConvert PNG images to efficient WebP files locally.→WebP to PNGConvert WebP images to PNG directly in your browser.→JPG to WebPConvert JPG images to efficient WebP files locally.→WebP to JPGConvert WebP images to broadly supported JPG files locally.→Resize imageResize one or many images to exact pixel dimensions.→Compress imageReduce image file size with an adjustable quality setting.→Crop imageCrop images by entering precise coordinates and dimensions.→Rotate imageRotate images clockwise or counterclockwise without uploading.→View metadataInspect available image and EXIF metadata privately.→Remove metadataCreate a clean image copy without embedded metadata.→Format JSONPretty-print or minify JSON in your browser.→Validate JSONValidate JSON syntax and locate errors.→JSON to CSVConvert arrays of JSON objects into CSV.→CSV to JSONConvert CSV rows into structured JSON objects.→JSON to YAMLConvert valid JSON into readable YAML.→YAML to JSONConvert YAML documents into formatted JSON.→JSON to XMLConvert JSON data into an XML document.→XML to JSONConvert XML documents into formatted JSON.→Base64Encode text or files as Base64 and decode Base64 locally.→URL encodeEncode or decode URL components safely.→Generate hashGenerate SHA-256, SHA-384 or SHA-512 hashes using Web Crypto.→Generate UUIDGenerate cryptographically strong UUID v4 identifiers.→Unix timestampConvert between Unix timestamps and human-readable dates.→Compare textCompare two blocks of text line by line.→Count wordsCount words, characters, sentences and lines instantly.→Deduplicate linesRemove repeated lines while preserving the first occurrence.→Sort linesSort lines alphabetically, naturally or in reverse.→

Practical guide · 5 min read

How to compress images without obvious quality loss

Good compression is not about choosing the lowest possible quality. It is about removing pixels and detail that the intended display cannot use, then checking the result in context.

Published and reviewed by Filemivo · 4 September 2026

Resize before adjusting quality

An image displayed at 1200 pixels wide rarely needs to be delivered at 5000 pixels wide. Reducing dimensions first often saves more data than aggressive compression and usually produces a cleaner result.

Export at the largest size the design actually displays, allowing extra resolution only when high-density screens or zooming genuinely require it.

Match the format to the content

Photographs compress efficiently with lossy WebP or JPG. Flat graphics, transparency and small text may look better in PNG or lossless WebP.

Converting a poor-quality source into a newer format cannot recreate detail that is already gone. Always begin with the best source available.

Compare at realistic and full size

Check the result at the size visitors will see it, then inspect important edges and gradients at 100% zoom. Look for blockiness, colour banding, halos around text and smeared detail.

If the output looks damaged, increase quality in small steps. If it looks identical, lower quality gradually until the first visible problem and then move one step back.

Use a repeatable workflow

Keep the source, record the intended display dimensions and compare file sizes only after visual review. This makes later updates consistent.

  • Copy the original before processing.
  • Resize to the required dimensions.
  • Try WebP and the format already used by your workflow.
  • Inspect the output and retain the smallest acceptable version.