Private Image Compression Benchmark: Three Real Screenshots
Measured local results for three real Windows PNG screenshots compressed at the same browser quality setting.
Get the answerReduce file size privately
Compress an image without uploading it
Reduce JPEG, PNG or WebP size in your browser, compare the result and receive a clean re-encoded copy whose ordinary source metadata is not copied.
Compress an image Completely free No account or payment Image stays on this device
USE THIS WHENUse this when an image is too large for a website, email, form or sharing workflow.SUPPORTED INPUTJPEG · PNG · WebP
What you will getA clear result before technical detail
01A locally compressed copy
02Before-and-after size and savings
03Verified output format, dimensions and metadata result
Local processing Image bytes stay on this device
Choose an image to compressJPEG, PNG or WebP · local re-encoding
No upload, account or watermarkSession diagnosticsNo processing errors
Stored only in this browser tab. Image bytes, filenames and metadata are never included.
No tool error has been recorded in this tab.
Useful and careful
What is built into the result.
Important findings come first. Technical fields remain available without taking over the page.
01
Quality, dimensions and output format stay under your control
02
The original is never changed
03
No account, watermark or upload queue
Three simple steps
Know what happens before you start.
Use this when an image is too large for a website, email, form or sharing workflow.
- ChooseSelect an image and review the input format, dimensions and metadata status.
- AdjustChoose format, width and quality with clear transparency behavior.
- VerifyThe new copy is reparsed before download.
RESULT ORDER
01 · A locally compressed copy02 · Before-and-after size and savings03 · Verified output format, dimensions and metadata result04 · Limits and next step
Continue when useful
Your next step, without starting over.
Move to another page only when its outcome matches what you need.
Important limitations
Full limitations Re-encoding changes compressed pixel data · PNG may grow for photographic content · AVIF output depends on browser support