Resize Image
Resize images free in your browser. No upload, no watermark.
.jpg, .png, .webp · up to 50 MB
What it's for
Precise resizing for web and social media
Social media presets
Instagram, Twitter, YouTube, LinkedIn — exact dimensions in one click.
100% private
Your image is resized in your browser. Never uploaded to any server.
Smart aspect ratio
Maintain proportions automatically or set them freely.
Instant
Result in under 1 second. No queues, no signup.
How it works
Three steps, no hassle
Upload your image
Drag or select a JPG, PNG, or WebP file. Up to 50 MB. No signup.
Set the dimensions
Enter width or height in pixels. Aspect ratio is maintained automatically, or disable it for custom dimensions.
Download the resized image
Processed instantly in your browser. Download with no watermark.
FAQ
Got questions?
When downscaling, information loss is inevitable, but the visual impact depends on the algorithm. Bicubic interpolation examines the 16 neighboring pixels of each point and produces a smooth, high-quality result — it's the standard in Photoshop and most professional editors. When upscaling, the effect is more severe: classic algorithms like bilinear or bicubic create blurry images because they're inventing information that doesn't exist. AI-based super-resolution algorithms (like ESRGAN) do a better job but require intensive processing.
Downscaling discards pixels and is a destructive but high-quality operation: there's more original information than needed. Upscaling requires creating new pixels that don't exist in the original, using mathematical interpolation. The result always has some degree of softening or blur. A practical rule: never upscale more than 150% without expecting loss of sharpness. For vector logos and icons (SVG), scaling is perfect because the image is recalculated mathematically at any size.
Aspect ratio is the relationship between an image's width and height, expressed as a proportion (16:9, 4:3, 1:1, 3:2). Maintaining aspect ratio when resizing preserves original proportions. If you change it, the image will stretch or squash. 16:9 is the standard for video and modern screens. 1:1 is the Instagram feed format. 3:2 is the traditional 35mm photography ratio and native to most DSLR cameras.
Instagram feed: 1080×1080 px (square) or 1080×1350 px (portrait). Instagram Stories: 1080×1920 px. Twitter/X post: 1200×675 px. YouTube thumbnail: 1280×720 px. Facebook post: 1200×630 px. LinkedIn post: 1200×628 px. For profiles: Instagram 320×320 px, LinkedIn 400×400 px, Twitter 400×400 px. Using exact dimensions prevents the platform from rescaling your image and applying its own compression.
Pixels are absolute units: a 1920×1080 px image has exactly 2,073,600 pixels regardless of DPI. DPI (dots per inch) is a relative unit indicating how many pixels are printed per inch. For screen display, DPI is irrelevant — only total pixels matter. For printing, 300 DPI is the standard for photographic quality. A 3000×2000 px image printed at 300 DPI yields a 10×6.67 inch photo. The 72 DPI for web myth is a historical error inherited from the first Mac screens in 1984; modern displays have highly variable pixel densities.
Resizing images: pixels, DPI, and interpolation algorithms explained
Resizing images is one of the most common operations in web design and digital photography, but few understand the physics behind the process. When you reduce an image from 4000×3000 px to 800×600 px, the algorithm must map 12 million pixels to 480,000 — discarding 96% of the original information. The quality of the result depends entirely on the interpolation algorithm used. Nearest-neighbor interpolation simply selects the closest pixel, producing pixelated but fast results — ideal for pixel art. Bilinear interpolation averages the 4 neighboring pixels. Bicubic uses the 16 neighbors and applies a cubic weight function, producing smoother and more natural results.
The 72 DPI for web myth persists in design manuals since the 1990s. It originates from the first Macintosh screen (1984), which had exactly 72 pixels per inch so that documents displayed at actual size. Today screens have highly variable densities: an iPhone 15 Pro has 460 PPI, a 27-inch 4K monitor has 163 PPI. For web, the only value that matters is the total number of pixels, not DPI. A 800×600 px JPG at 72 DPI and another at 300 DPI look identical on screen and have virtually the same file size.
For responsive images in web development, the HTML img element with the srcset attribute allows serving different sizes depending on the device: the 400 px version for mobile, 800 px for tablet, and 1600 px for desktop. This prevents a mobile device from downloading a 3 MB image designed for a 4K screen. Combined with the sizes attribute and WebP format, srcsets can reduce mobile data consumption by 70-80% with zero impact on perceived quality.