Image Resizer – Resize Images Online Free, Bulk & Private
Resize JPG, PNG, WebP images online in pixels, inches or millimeters. Bulk upload multiple images, lock aspect ratio, choose output format and download as ZIP. 100% browser-based — your images never leave your device.
No signup · No upload to server · Free forever · Works on mobile & desktop
Click here or drop images to upload
Supports JPG, PNG, WebP · Bulk upload up to 30MB each
Free Online Image Resizer — Fast, Private & Bulk-Ready
Whether you're a photographer, designer, blogger, e-commerce seller, or social media manager, our free online image resizer makes it effortless to resize images to exact dimensions. Set width and height in pixels, inches, or millimeters, choose your output format, and download — no software to install, no account required, and your images are never uploaded to any server.
How to Resize Images Online
Upload Images
Click or drag & drop. Select one or multiple JPG, PNG, WebP files.
Set Dimensions
Enter width/height in px, inches or mm. Use a social media preset for quick sizing.
Choose Format
Select JPEG, PNG or WebP. Optionally set a target file size in KB or MB.
Download
Resize all, then download individually or as a single ZIP archive. No watermarks.
Key Features
px, inches & mm
Resize in pixels, inches or millimeters — great for print and screen use
Bulk Resize
Upload and resize dozens of images at once — download all as a ZIP
100% Private
Everything runs in your browser — images never touch a server
Target File Size
Set desired output size in KB/MB — tool auto-adjusts JPEG quality
Lock Aspect Ratio
Auto-syncs height when you change width — no stretching or distortion
Mobile Friendly
Works on iPhone, Android and tablet browsers — no app needed
Resize Images in Pixels, Inches or Millimeters
Most online image resizers only offer pixel resizing. Our tool supports three units of measurement. Pixels (px) is ideal for web, social media, and digital use. Inches (in) is perfect for US print standards — set 800×600 at 96 DPI for standard documents. Millimeters (mm) is essential for international print (A4 paper is 210×297 mm). This makes our tool ideal for photographers preparing print-ready files, designers creating assets for multiple formats, and office users preparing presentation images.
How to Resize Images Without Losing Quality
To resize an image without visible quality loss: (1) avoid upscaling beyond the original resolution — enlarging creates pixelation. (2) Use PNG for graphics and logos — it's lossless. (3) For photos, use JPEG at 80–90% quality to balance size and sharpness. (4) Use WebP for the best compression — up to 30% smaller than JPEG at the same visual quality. Our tool uses high-quality HTML5 Canvas bi-linear interpolation for the sharpest output possible.
How to Reduce Image File Size to a Specific KB
Enter a value in the Target file size field and select KB or MB. The tool will automatically reduce JPEG or WebP quality until your target size is met. This is extremely useful for online form uploads that have strict file size limits (e.g., passport photo uploads, CV attachments, government portals). For maximum file size reduction, choose WebP format — it typically achieves the smallest file sizes at high visual quality.
Social Media Image Size Guide
- Instagram Square: 1080×1080 px
- Instagram Portrait: 1080×1350 px
- Instagram Story / Reel: 1080×1920 px
- Facebook Post: 1200×628 px
- Twitter / X Header: 1500×500 px
- LinkedIn Cover: 1584×396 px
- YouTube Thumbnail: 1280×720 px
- WhatsApp DP: 500×500 px
All popular sizes are available as one-click presets in the tool above.
Explore Our Other Free Tools
ToolPlex is a free online platform offering practical tools for students, professionals and businesses. You can explore our other image tools like Image Compressor, Image to PDF Converter, Passport Size Photo Maker, Photo Date & Time Stamper and JPEG Compressor, You can use our document tools which can be useful for every segment of people, these tools are PDF to DOCX converter, DOCX to PDF converter. Our other Text & Utility tools like Word Counter, QR Code Generator, Sentence Case Converter and Fancy Text Generator are very useful in everyday's life. Our Finance tools help the user to plan & track their financial goals Such as SIP Calculator, EMI Calculator, Stock Average Calculator, FD Calculator, Lumpsum Calculator. Toolplex have many billing related tools like Payment Receipt Generator, Invoice Generator, Estimate Generator and many more — all free, no signup, 100% private.