Image formats, image compression and ZIP files, explained simply
By Nasir Uddin Shamim4 guidesUse an image converter to change a picture between JPG, PNG, WebP and AVIF, an image compressor to cut its file size, and a ZIP tool to pack many files into one or unpack one you were sent. All four run in your browser, so nothing is uploaded and there is no limit on how often you use them.
Not every file job is a PDF job. Sometimes a form wants a JPG and you have a PNG. Sometimes a website refuses a 9 MB photograph and wants it under 2 MB. Sometimes you need to send eleven files to someone who can only accept one attachment. These four guides cover the everyday file work that surrounds documents: changing an image format, making a picture smaller without it looking chewed, and packing or unpacking a ZIP archive. All four tools run inside your browser tab, so the files never leave your computer and no monthly quota applies to any of them.
Every guide in this topic
How to convert an image between JPG, PNG, WebP and AVIF
Open the image in a converter, pick the format you want, and download the result. Photographs belong in JPG or WebP; screenshots, logos, diagrams and anything needing transparency belong in PNG. Converting is one-way for quality: turning a JPG into a PNG cannot bring back detail the JPG already threw away.
How to compress an image without it looking wrecked
Drop the picture into a compressor, lower the quality setting until the preview starts to look soft, then step back one notch and download. Quality around 75 to 80 removes most of the file size and little of the detail. If the image is bigger than it needs to be on screen, cutting its pixel dimensions saves far more than any quality slider.
How to make a ZIP file, and when zipping is pointless
Select the files, add them to a ZIP tool, and download the single .zip that comes out. A ZIP is one file that holds many, and it compresses them on the way in. Documents, spreadsheets and text shrink a lot. JPGs, MP4s and PDFs are already compressed, so zipping them mainly makes them convenient, not smaller.
How to open a ZIP file on any device
On Windows, right-click the file and choose Extract All. On macOS, double-click it. On iPhone and Android, tap it in the Files app and the system unpacks it. A browser tool works on any of them and lists the contents before you extract. A password-protected ZIP needs its password; no tool can open it without one.
Tools for this job
Image Converter
HEIC, PNG, JPG, WebP, SVG
Compress Image
Make pictures smaller
Create ZIP
Pack files into one ZIP
Extract ZIP
Open a ZIP file
Other topics
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Compressing PDF files
Compress a PDF in your browser for free. Lossless structural compression, image downsampling, DPI targets, email size limits and why your PDF got so big.
Converting PDF to other formats
How to get a PDF back into an editable format: Word, Excel, plain text and slides, what each conversion really preserves, and when the answer is to retype.