Browser-local converter

Browser Image Compressor

Convert JPEG, PNG or static WebP still images to JPG with bounded browser work and verified output bytes.

Output: image/jpegExtension: .jpgSource metadata not preserved

Bounded local intake

Add still raster images

Binary signatures and dimensions are checked before files enter the queue. Animated, multi-image, truncated, and structurally ambiguous inputs are rejected.

Accepted signatures: JPEG, PNG, WEBP · up to 30 files within one decoded-work budget · paste with Ctrl/Cmd+V

Verified destination

Output contract

image/jpeg · .jpg

Presets

Lossy JPEG. Transparency is flattened onto your selected background.

Quality: 80%Lossy encoder quality; size is content-dependent.Transparency background#FFFFFFJPEG cannot store alpha; transparent pixels are flattened.Maximum widthOptional maximum; aspect ratio is retained and images are not enlarged.Maximum heightOptional maximum; aspect ratio is retained and images are not enlarged.

Output filename patternUse {name} for the local source stem and {index} for a padded queue number. Unsafe path characters and duplicate names are corrected before download.

Bounded queue

0 files checked

No file bytes are retained yet. Add files above to run signature, dimension, and browser-decode checks.

Metadata outcome

Browser-decoded orientation is rendered into output pixels; manual orientation controls are not provided here.
EXIF, GPS, capture date, and source metadata are stripped by canvas re-encoding.
ICC profiles are not preserved; browser color conversion may change wide-gamut or HDR sources to SDR.
Alpha is flattened to the selected background.

Local boundary

Selecting a file gives this tab temporary local access to its bytes. Conversion code runs in the browser and this workflow does not send file bytes, names, content, or precise dimensions to analytics. Ordinary page requests and coarse product events still use the network. Files and object URLs remain until you remove them, clear the workbench, or close the tab.

Raster work is limited to one or two concurrent browser jobs. Some canvas work can still occupy the main thread; cancellation is cooperative and an in-flight browser decode may finish before its result is discarded.

Instructions

How this conversion works

01Select .jpg or .jpeg or .png or .webp files. The browser checks type and total work before processing.
02Review the JPG controls and start conversion. Unsupported browser decoders are reported as a retryable file error.
03Download output only after its MIME, signature and extension contract passes.

Limitations

Read before processing

Files are processed in browser memory. Site assets and coarse analytics still use ordinary network requests; file bytes and names are excluded from events.
Canvas-based output does not preserve source EXIF, GPS, capture date or embedded ICC profiles.
A download is exposed only when the result reports JPG bytes that agree with its MIME and extension.

Why people compress images

Compression is usually forced by a limit somewhere: an email attachment cap, a web form that rejects anything over a few megabytes, a job application portal, or a page that loads too slowly because its images are too heavy. Re-encoding at a lower quality setting is the direct lever — it discards detail the eye is least likely to miss and can often cut a file by most of its size with no visible change. What no compressor can honestly promise is a specific output size in advance, because how far an image compresses depends on its content.

How to convert JPEG, PNG or static WebP to JPG

1. Add JPEG, PNG or static WebP files for bounded signature and decoder checks.

2. Review JPG controls and the decoded-work estimate.

3. Start the cancellable queue.

4. Download files only after output validation passes.

Capability boundary

This route re-encodes to lossy JPEG. It does not promise a target size or a fixed compression percentage.

Questions

Frequently asked questions

Can I compress an image to an exact file size?

Not reliably, and this tool does not claim to. How small an image gets at a given quality setting depends on its content — a photograph of a plain wall compresses far further than a detailed landscape. Adjust the quality control, look at the resulting size, and repeat if you need to go smaller.

Does compressing an image reduce its dimensions?

No. Compression re-encodes the same pixel grid more aggressively and leaves the width and height alone. If the image is larger than it needs to be on screen, resizing it will usually save more than compression does — often the two together are what you want.

How is JPG output checked?

The browser encoder must return the expected MIME and binary signature. The result is decoded again and its dimensions are checked before download.

What happens to source metadata?

Canvas re-encoding strips EXIF, GPS and capture date. ICC profiles are not preserved, and HDR or wide-gamut input may be converted to SDR.

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