JPG
Usually compact for photos. Transparency is replaced with white.
PhotosPrivate, browser-based image resizing
Increase image size in KB, exactly
Set an exact KB or MB target. Your image stays in this browser and is never uploaded.
✓ Private by design✓ Exact byte target✓ No sign-up
Your images do not leave this tab
Processing and downloads happen locally. Refreshing or closing the page clears the current queue.
Set your target and add images
1 KB = 1024 bytes. 1 MB = 1024 x 1024 bytes.
1 KB = 1024 bytes. 1 MB = 1024 x 1024 bytes.
Drop images here or choose files
JPG, PNG or WebP. Up to 20 files, 20 MB each.
Image queue
No images selected yet.Choose one image or a batch of up to 20 files.
Three steps, no upload
The controls are intentionally direct. Choose images, set the byte requirement, then download verified results.
Select
Add one JPG, PNG or WebP, or choose a batch of up to 20.
Set target
Choose exact, maximum or minimum size in KB or MB.
Download
Every result is decoded and checked again before download.
Why exact KB matters
Government forms, job portals, exams, identity documents and content systems often enforce rigid file limits. A valid image can still be rejected when its byte count falls outside the stated range. This tool changes the encoded file size without claiming to create new visual detail.
Exact mode is deliberately strict. A 100KB result is 102,400 bytes, not a rounded label placed on an approximate file. Maximum mode is different: it keeps the result at or below the ceiling and avoids adding filler to a smaller valid image. Minimum mode guarantees the result is not below the stated target.
KBstored bytes
PXwidth x height
File size is not image dimensions
KB and MB measure stored bytes. Width and height measure pixels. An image can keep the same dimensions while its encoding changes, but a very small maximum may require dimension reduction. The result always reports both values.
The browser first tries to keep the original pixel dimensions. For JPG and WebP it searches encoding quality. For PNG it uses the browser's lossless encoder. If a maximum is still unreachable and reduction is allowed, the pixel grid becomes smaller in controlled steps.
Choose the format that fits the job
PNG
Keeps transparency and sharp edges, but can be larger for photos.
TransparencyWebP
Often provides a useful balance of size, quality and transparency.
Modern webLocal processing is the privacy feature
The site does not need your image data to resize it. Files, names, previews and output blobs remain in browser memory. Optional analytics can record anonymous actions such as a completed batch, never file contents or file names.
Refreshing the page clears the queue. Result URLs are revoked when an item is removed or the tool is reset. Re-encoding also removes common EXIF metadata by default, including camera and location fields that may be embedded in a source photo.
Questions about exact image size
Are my images uploaded?
No. Processing happens in the current browser tab. The server does not receive image contents, file names or output files.
Does increasing KB improve image quality?
No. Adding encoded bytes does not create new visual detail. The purpose is to satisfy a file-size requirement, not to perform AI upscaling.
What does exact mean?
The downloaded Blob must contain exactly the target number of bytes. Targets use 1KB = 1024 bytes and are verified after processing.
What formats are supported?
JPG and JPEG, PNG and WebP are supported for input and output. GIF, SVG and HEIC are not supported in this version.
Will image dimensions change?
Increasing file size usually keeps the same dimensions. Reaching a small maximum may require fewer pixels, and the result shows both dimensions.
Does it work on mobile?
Yes in current Chrome, Edge, Firefox and Safari. Large batches may finish faster on a desktop because all processing uses local device memory.
Is metadata kept?
No by default. Re-encoding removes common EXIF metadata, which can include camera and location information.