Compress images
Efficient re-encoding with MozJPEG, libwebp and OxiPNG shrinks files with almost no visible change. For upload limits such as "2 MB max", use target-size mode, which automatically finds the highest quality that fits.
Settings
How to use
- 1
Add images
Drop the images you want to shrink. JPG, PNG, WebP, HEIC and other common formats are accepted.
- 2
Choose quality or a target size
Either set a quality value or specify a maximum size in KB. The latter automatically finds the highest quality that fits.
- 3
Run and check
After processing you see the original and compressed sizes and the reduction. Adjust and run again if needed.
How much smaller does it get?
A phone JPG of 3–5 MB typically becomes around 1 MB at quality 75, or around 600 KB as WebP. PNG is already lossless, so gains are smaller: OxiPNG optimisation saves 10–30%. To shrink a PNG photo substantially, convert it to WebP or JPG.
Combining this with "Max long side" has the biggest effect. Shrinking a 4000 px photo to 2000 px quarters the pixel count and roughly quarters the file. For web and email use, that setting alone is usually enough.
Frequently asked questions
What if the target size cannot be reached?
If even the lowest quality does not fit, that result is returned with a warning. Reduce the pixel count with "Max long side" or convert to WebP.
How much quality is lost?
At quality 70 or above you are unlikely to notice any difference on screen. For screenshots with text and thin lines, use a higher quality or keep them as optimised PNG.
Does repeated compression degrade the image?
Yes. JPG, WebP and AVIF are lossy, so compressing an already compressed image degrades it a little more each time. Keep the original and produce the sizes you need from it.
Can I compress transparent PNGs?
Yes. Keep the format as-is or choose PNG to optimise while preserving transparency. WebP also keeps transparency and is smaller still. JPG turns transparent areas white.
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.