FluffyBench

Image Space Saver

Resize, compress to a file size, and convert mixed image batches locally.

FluffyShield Protected workspace
FluffyShield

Isolated workspace: other page scripts can't read your files. How FluffyShield works

How it works
  1. Choose images
  2. Open Settings and choose Custom
  3. Set dimensions, format, and a file-size limit
  4. Process, check, and download

Keep the whole frame

Resize the picture without cutting away its edges.

Work toward an upload cap

Custom reveals the per-file size limit and quality ceiling.

Save a group together

Download finished pictures individually or together in a ZIP.

Limits Processing stays in your browser on your device; batch size depends on available memory.

Need a photo to fit an upload limit?

FluffyBench Image Space Saver can resize your pictures and try quality settings against a file-size limit. You get a preview and a size readout to check before saving.

FluffyBench · 5 min read · Measured with this tool

What changes when you resize or compress a picture?

Think of a picture as a grid of tiny tiles. Size changes the grid; compression changes how compactly that grid is saved.

A mountain picture on a pixel grid, the whole frame fitted inside smaller bounds, and a compressed copy with the original grid dimensions.

Two ways to make a picture smaller

With Keep aspect ratio on, the whole frame fits inside your width and height bounds without stretching. How we reviewed

Resizing keeps the full picture. If you need to remove an edge or change the framing, FluffyBench Image Crop lets you choose what stays.

For help choosing between pixels, compression, and a new format, read resize, compress, or convert?.

Check what a smaller file can lose

This mountain photo went from 678.2 KB to 39.4 KB without changing its pixel dimensions.

Original Stanton Mountain photograph, with the detail region marked.

Original JPG

The smaller JPG at the same display size, with the matching detail region marked.

JPG under the size limit

Both JPGs are 1920 × 1276 pixels. The saved copy fits the requested 40.0 KB ceiling. · Photo: GlacierNPS / National Park Service, Public domain in the United States; National Park Service employee work, via Wikimedia Commons.

Compare the marked patch in the original JPG and the smaller saved copy.

Trees and mountain texture in the original JPG.

Original detail

Matching trees and mountain texture after the size search, showing lost fine detail.

Smaller JPG detail

The smaller JPG softens the trees and mountain texture. These matching crops come from files with the same pixel dimensions. · Photo: GlacierNPS / National Park Service, Public domain in the United States; National Park Service employee work, via Wikimedia Commons.

Need help interpreting an upload cap? See getting a photo under an upload size limit.

Doing it in FluffyBench Image Space Saver

FluffyBench Image Space Saver's Custom profile gives you control over file type, dimensions, and a per-file size cap. Here's the whole job, from choosing pictures to downloading the results.

  1. Choose the pictures you want to make smaller.
    Choose the pictures you want to make smaller.
    Step 1. Choose the pictures you want to make smaller.
    1. Choose images opens your file picker.
  2. Open Settings to choose how your pictures will be saved.
    Open Settings to choose how your pictures will be saved.
    Step 2. Open Settings to choose how your pictures will be saved.
    1. Settings opens the image controls.
  3. Choose Profile > Custom for an explicit format, quality ceiling, and file-size limit.
    Choose Profile > Custom for an explicit format, quality ceiling, and file-size limit.
    Step 3. Choose Profile > Custom for an explicit format, quality ceiling, and file-size limit.
    1. Custom reveals the controls used below.
  4. Choose the destination's pixel bounds. Original keeps the dimensions; Percentage scales the whole picture.
    Choose the destination's pixel bounds. Original keeps the dimensions; Percentage scales the whole picture.
    Step 4. Choose the destination's pixel bounds. Original keeps the dimensions; Percentage scales the whole picture.
    1. Dimensions lets you enter pixel bounds.
    2. Width and Height bound the whole frame; Keep aspect ratio avoids stretching.
  5. Same as source keeps each writable input format. For a required file type, choose that type in Format.
    Same as source keeps each writable input format. For a required file type, choose that type in Format.
    Step 5. Same as source keeps each writable input format. For a required file type, choose that type in Format.
    1. Same as source keeps writable input formats.
  6. Maximum quality is the highest quality the size search will try. Lower settings trade fine detail for fewer bytes.
    Maximum quality is the highest quality the size search will try. Lower settings trade fine detail for fewer bytes.
    Step 6. Maximum quality is the highest quality the size search will try. Lower settings trade fine detail for fewer bytes.
    1. Set the quality ceiling to 80.
  7. Turn on Limit each file's size and enter your upload cap in KB.
    Turn on Limit each file's size and enter your upload cap in KB.
    Step 7. Turn on Limit each file's size and enter your upload cap in KB.
    1. Enable a separate limit for each image.
    2. Enter 40 KB for this walkthrough.
  8. Tap Settings again to close the controls.
    Tap Settings again to close the controls.
    Step 8. Tap Settings again to close the controls.
    1. Settings closes the controls on a phone.
  9. Press Process 2 images to create the smaller copies.
    Press Process 2 images to create the smaller copies.
    Step 9. Press Process 2 images to create the smaller copies.
    1. Process 2 images applies these settings to the group.
  10. Check each result's dimensions and file size. Download saves that image; keep your original for later edits.
    Check each result's dimensions and file size. Download saves that image; keep your original for later edits.
    Step 10. Check each result's dimensions and file size. Download saves that image; keep your original for later edits.
    1. Check the finished file size and dimensions.
    2. Download saves this finished image.
  11. Download all (ZIP) saves the completed group together.
    Download all (ZIP) saves the completed group together.
    Step 11. Download all (ZIP) saves the completed group together.
    1. Download all (ZIP) bundles the finished files.

Check a failed picture or a Kept original warning

If Image Space Saver reports Failed after a size-limit search, there's no finished copy to download.

  1. A size cap can be too small even at the lowest quality. This run at Original size with a 1 KB cap ends in Failed; smaller dimensions can help.
    A size cap can be too small even at the lowest quality. This run at Original size with a 1 KB cap ends in Failed; smaller dimensions can help.
    Step 1. A size cap can be too small even at the lowest quality. This run at Original size with a 1 KB cap ends in Failed; smaller dimensions can help.
    1. This image couldn't be processed with these settings.
  2. Needs a look brings errors and warnings together.
    Needs a look brings errors and warnings together.
    Step 2. Needs a look brings errors and warnings together.
    1. Choose Needs a look to review files that need attention.

If a result says Kept original when you expected another file type, the i button has the explanation.

  1. Kept original means the converted copy was not smaller. Open the i button to read its warning.
    Kept original means the converted copy was not smaller. Open the i button to read its warning.
    Step 1. Kept original means the converted copy was not smaller. Open the i button to read its warning.
    1. Kept original explains why the requested format did not replace the input.
    2. The i button opens the image warning.
  2. The open warning explains that the original file and its metadata were kept.
    The open warning explains that the original file and its metadata were kept.
    Step 2. The warning confirms that the original file was kept, including its type and metadata.
    1. The warning explains why the original was kept.

If you need a JPG file regardless of savings, FluffyBench's JPG converter is the better fit: its job is to make that format.

For more on saving groups, see batch downloads: ZIPs, folders, and files.

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