Image quality
Does removing metadata reduce image quality?
Removing metadata does not need to reduce image quality. The result depends on whether the tool edits the file container or decodes and re-encodes the picture.
Container-level cleaning
JPEG stores compressed scan data separately from APP metadata segments. PNG keeps compressed pixels in IDAT chunks, while WebP uses VP8, VP8L and related chunks. A lossless metadata operation copies those image payloads and omits selected metadata containers.
Because the compressed image data is copied rather than recreated, there is no additional JPEG generation loss, resampling or color conversion. MetaPurify hashes the relevant image payload before and after cleaning to verify this property — if the two hashes match, the picture in the cleaned file is the same picture, byte for byte. How to verify metadata was actually removed walks through checking that yourself.
Canvas re-encoding
Some browser tools draw an image to a canvas and export a new file. That removes many metadata types, but a JPEG is compressed again and may receive different colors, dimensions or orientation. It can still look good, but it is not byte-preserving.
Rendering metadata matters
An ICC profile helps applications interpret color. EXIF orientation tells a viewer how stored pixels should be rotated or mirrored. Blindly deleting either can change appearance even when the pixel payload is untouched.
MetaPurify keeps color profiles and supported orientation information by default, then explains any rendering metadata retained in the output. Which formats carry which of these structures is listed on the supported formats page.
If the file does need to get smaller
Cleaning metadata saves kilobytes, not megabytes. When the goal is a smaller file rather than a private one, the work belongs in the image compressor, which targets a file size directly — and, unlike a metadata clean, does change the pixels.
Common questions
Does removing metadata make the file smaller?
A little. Metadata is usually a few kilobytes against an image payload measured in megabytes, so the saving is real but small. If a file needs to be meaningfully smaller, that is a compression job, not a metadata one.
Does stripping metadata remove my copyright information?
It does if you remove the fields that hold it. Copyright, author and credit live in EXIF and XMP, so a blanket clean takes them with everything else. Removing the categories you actually care about leaves the rest in place.
Do resizing and compressing remove metadata as well?
Not reliably. Resizing and compressing rewrite the pixels, and whether the metadata survives depends entirely on the tool. Treat them as separate operations and check the output.
Is removing metadata reversible?
No. The cleaned file simply no longer contains those segments, so keep the original if the information matters to you and share the cleaned copy instead.