About PictureSizes.com

A free, quick reference for every image dimension question — from social media posts to device screens and print.

What this site is

PictureSizes.com is a reference site for anyone who works with image dimensions: designers preparing assets for social media, developers sizing responsive images, photographers planning print output, and creators who simply need the right pixel count on the first try.

Rather than search listicles or outdated platform help articles, visitors can jump straight to a specific spec page, use a small in-browser calculator, or compare standards side by side. Everything is free and nothing is gated behind a sign-up.

Who this site is for

  • Designers & content creators preparing posts, reels, thumbnails, banners, or cover images.
  • Developers specifying width/height attributes, responsive breakpoints, and aspect-ratio CSS.
  • Marketing & social teams double-checking current platform specs before publishing.
  • Photographers & print buyers matching camera sensor output to paper and photo-print sizes.
  • Students and newcomers learning how pixels, DPI/PPI, and aspect ratios relate to each other.

What the site covers

Calculators & tools

In-browser calculators for aspect ratio, pixel-to-centimetre and pixel-to-inch conversions, DPI and PPI, megapixels, file-size estimation, responsive breakpoints, colour-format conversion, image resizing, and image compression.

Social media specs

Current image dimensions for Instagram, Facebook, X (Twitter), YouTube, TikTok, LinkedIn, Pinterest, Threads, Snapchat, WhatsApp, Twitch, Reddit, Discord, Shopify, and Etsy — profile photos, covers, feed posts, stories, reels, and ad placements.

Device resolutions

Screen specifications for iPhone (including the iPhone 17 series), Samsung Galaxy, Google Pixel, iPad, MacBook, iMac, Apple Watch, common external monitors, and TVs — native resolution, scaled points, PPI, and aspect ratio.

Print & paper sizes

ISO A-series (A0–A10), ISO B-series, US Letter/Legal/Tabloid, standard photo-print sizes (4×6 through 11×14 and larger), billboard and poster dimensions, and business-card sizes — with pixel requirements at 72, 150, and 300 DPI.

Visual comparisons

Side-by-side visual guides for camera sensors (full-frame vs APS-C vs Micro Four Thirds vs 1-inch), paper sizes (A4 vs US Letter), screen resolutions (HD, FHD, QHD, 4K, 8K), aspect ratios, and social-platform image formats.

Guides & blog

Longer-form explainers on DPI vs PPI, responsive image techniques, aspect ratios, file formats (JPEG, PNG, WebP, AVIF), image optimisation, and Instagram best practices — plus occasional posts noting platform spec changes.

Editorial approach

Spec pages are written as quick, scannable references rather than narrative articles. Every dimension table lists the measurement and, where relevant, the recommended upload size, aspect ratio, and any platform-specific caveats.

When a social network changes a spec, the affected page is updated and the change is noted briefly. Where specs depend on regional or device differences — for example iPhone status-bar safe areas or local paper standards — the page calls that out rather than pretending one number fits every case.

Where something is general guidance rather than a hard platform requirement (for example, "300 DPI is standard for photographic print"), the page says so. Official platform documentation always takes precedence over a third-party reference, and links are provided where helpful.

How content is produced

  • Primary sources: platform help centres, official device specification pages, ISO/ANSI paper standards, and manufacturer datasheets.
  • Review cadence: social-media and device pages are revisited periodically — typically each month for fast-moving platforms and at least quarterly for more stable specs.
  • Corrections: if a specification changes between review cycles, or if a reader reports an error, the affected page is updated and a brief note added.
  • Independence: the site is not affiliated with or endorsed by any of the platforms, device manufacturers, or standards bodies whose specifications are referenced.

Privacy, tools, and how the site works

All calculators and image utilities (aspect ratio, DPI/PPI, image resizer, image compressor, colour converter, CSS generator, breakpoint calculator) run locally in the browser using the HTML Canvas API and plain JavaScript. Images selected in a resizer or compressor are never uploaded to any server.

The site uses Google Analytics for basic, aggregate usage statistics and may display advertising provided by Google. See the Privacy Policy and Cookie Policy for the full details.

Contact

Questions, corrections, or feature requests are welcome. The quickest way to get in touch is by email at [email protected], or via the contact page.

Last reviewed on 24 April 2026.