Resize images
Set a width or height and the aspect ratio is preserved. Fit-to-box mode lets you either fit inside the box without padding or fill it by cropping. Handy for profile pictures, blog thumbnails and any fixed-size target.
Settings
How to use
- 1
Add images
Drop the images you want to resize. Several images can be processed with the same settings.
- 2
Choose how to size
By width, by height, by percentage, or fit to a box. Aspect ratio is preserved automatically.
- 3
Run and save
Optionally change the output format, then press Run. The output size is appended to the file name.
Getting clean results
Downscaling uses a Lanczos3 filter. Compared with plain Canvas scaling it keeps thin lines and text crisp and avoids moiré. It is not suited to enlarging, which is why "Never enlarge" is on by default.
For the web, a long side of 1600–2000 px is plenty; anything larger just makes the file bigger without being displayed. Converting to WebP at the same time shrinks the file further.
Frequently asked questions
Is the aspect ratio preserved?
Always, for width, height and percentage modes. In fit-to-box mode, "Fit inside" and "Fill box" also preserve it; only "Stretch" ignores it and forces the exact box size.
Can I enlarge images?
Yes, if you turn off "Never enlarge". Enlarging interpolates pixels, so fine detail becomes soft. For sharp photo upscaling, use “AI upscale”.
Can I make several images exactly the same size?
Yes. Use fit-to-box with a width and height and choose "Fill box"; images of different proportions are all cropped to the same dimensions. Useful for thumbnails and galleries.
What is the output file name?
The output dimensions are appended to the original name. For example photo.jpg resized to 800 px wide becomes photo_800x600.jpg.
Help us improve the service
If a conversion fails, sending us the circumstances helps us track down the cause. Knowing which devices and formats fail most often, and how long processing takes, lets us revise the supported formats and fix the bugs behind them. If you don't mind, leaving this on is a real help.
What is sent
- The tool you used and the settings you chose (output format, quality, etc.)
- Your device specs (GPU, memory, core count)
- The input format with a rough size
- How many files succeeded or failed and how long it took
- The error type and details when something fails
What is never sent
- The files themselves and file names
- Text, subtitles or prompts you add to a video
- The text to be read aloud, voice descriptions, the pronunciation dictionary and saved voices
- The text in PDFs, the text you rewrote or redacted, passwords, font names and the page ranges you enter
- IP addresses
The data goes only to this site's own server, never to a third-party service.
Details sent by specific tools (counts, times, kinds and yes/no only)
In addition to “What is sent”, text to speech and the PDF tools send the following details.
- Text to speech
- The approximate number of characters and sentences, how many parts the text was generated in, and how long the AI model took to load.
- PDF tools (all)
- The page count range, whether editing is restricted, whether a permissions password was entered, and whether the PDF is signed or encrypted.
- PDF text editing and redaction
- The numbers of rewrites, deletions, white-outs and redactions, the number of rewritten characters by source (original font or fallback font, the latter as a range) and the fallback typeface, the kinds of reasons why lines cannot be edited, and the number of pages turned into images by redaction and the reasons.
- PDF page operations and conversion between images and PDF
- The numbers of inputs and outputs, of pages rotated, deleted, duplicated or moved, of images inserted as they are, converted, in HEIC format or with corrected orientation, and of pages rendered at a lower resolution (all as ranges), whether the original was updated in place or a new document was created, and whether the original protection was reapplied, form fields were written into the page and bookmarks were added back.
- PDF compression
- The numbers of inputs and outputs, of images downsized, not downsized and black-and-white, of downsized images whose transparency was also downsized, that stayed lossless or that were converted from CMYK to RGB, and how many times the file was compressed (all as ranges), the kinds of reasons images were not downsized, whether the target size was met and the kind of reason it was not met, the range of how much smaller the file got, whether the original protection was reapplied, and whether the original PDF was returned unchanged.
- PDF cropping and page numbers
- The numbers of inputs and outputs and of pages cropped, numbered or with their margins reduced (all as ranges), how the margins were set, how the pages to crop or number were chosen, the number format and position, the range of the starting number, that the original was updated in place, and whether the original protection was reapplied.