Upload size limits
Reduce a phone photo before submitting it to a form capped at 100KB.
Private, browser-based image resizing
Resize an image to 100KB or less
This page starts in At most mode. It finds a practical result no larger than 102,400 bytes and does not add filler when an image is already below the limit.
Product assurances✓ 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.
When a 100KB target is useful
When a source is much larger than 100KB, the browser first adjusts encoding quality and only reduces dimensions when needed. Disable dimension reduction if pixel dimensions must remain fixed, but some sources may then be unable to meet the limit.
Fast-loading thumbnails
Create a compact derivative for a page or internal content system.
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.
File size and dimensions comparison
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.
Choose the format that fits the job
JPG
Usually compact for photos. Transparency is replaced with white.
PhotosPNG
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.
Questions about exact image size
When should I use At most?
Use it for an upload ceiling such as 100KB or less. The tool does not add filler to a result that already satisfies the limit.
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.
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.
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.