Local Pillow resize that preserves aspect ratio
Images✓ Editorially reviewed
Resize Image
Shrink an image to a maximum dimension while keeping its aspect ratio.
Inputs .jpg, .jpeg, .png, .webpOutput .jpgMaximum 20 file(s)Processing Local Pillow resize that preserves aspect ratio
PROCESSING TRANSPARENCY
Trust center ↗Know what happens before you upload.
A temporary per-request workspace is cleaned when processing ends.
The requested maximum dimension must be between 16 and 8000 pixels. The tool preserves aspect ratio rather than forcing two independent dimensions, and it does not synthesize new detail. The output is JPEG, so it is not suitable when the resized copy must preserve alpha transparency or remain lossless.
Check the downloaded width and height and confirm neither exceeds the chosen maximum. Make sure the aspect ratio still looks natural, then inspect small text, thin edges, and any area that used to be transparent. If quality matters more than file size, compare the resized JPEG against the original at 100% view.
Workspace
ReadyUpload your file to start
Task completed successfullyDownload again
Input—Output—Size change—Time—
∞
INFINITY INTELLIGENCE
A copilot that understands this tool.
Ask what a setting means, whether this is the right tool, how to recover from an error, or what to do with the result next. Infinity receives safe context from this page — not the file contents automatically.
PRACTICAL CONTEXT
What this tool is good at — and where to be careful.
When this tool makes sense
Best for reducing a large image before a website upload, email, document, or LMS submission while keeping the original aspect ratio. You choose one maximum dimension and Infinity fits the image inside that width-and-height box. This avoids stretching and is intentionally a downsize workflow rather than a canvas editor where width and height are forced independently.
What the engine actually does
After EXIF orientation is normalized, Pillow uses a LANCZOS thumbnail operation with your chosen maximum width/height. Smaller images are not unnecessarily enlarged. The current public contract writes the resized result as JPEG using Infinity's output encoder, so transparent input pixels are flattened and exact source metadata is not the goal of this workflow.
What it does not promise
The requested maximum dimension must be between 16 and 8000 pixels. The tool preserves aspect ratio rather than forcing two independent dimensions, and it does not synthesize new detail. The output is JPEG, so it is not suitable when the resized copy must preserve alpha transparency or remain lossless.
A 20-second quality check
Check the downloaded width and height and confirm neither exceeds the chosen maximum. Make sure the aspect ratio still looks natural, then inspect small text, thin edges, and any area that used to be transparent. If quality matters more than file size, compare the resized JPEG against the original at 100% view.
Frequently asked questions
Does it distort the aspect ratio?
No. The thumbnail operation preserves aspect ratio inside the selected maximum dimension.
Will it upscale a small image?
No unnecessary enlargement is performed; this workflow is primarily designed for practical downsizing.
✦Clear limits
Supported formats and limits are shown before you start.
⌁No cloud file history
Public conversions are designed around temporary request workspaces, not permanent file storage.
◉Privacy explained