PhotoTools Blog

DPI to Pixels: How to Convert, With Charts for Every Print Size

Pixels = inches × DPI, so "300 DPI" alone is not a pixel count — you also need the print size. Here is the formula, conversion charts for common sizes in inches and cm, and how to go back from pixels to print size.

Updated July 11, 2026

US Passport Photo Requirements 2026: Complete Checklist (with the AI-Edit Rule)

The full US passport photo requirements checklist for 2026 — exact size (2 x 2 inches), head height, background, lighting, glasses, expression, clothing, makeup, baby photos, and the January 2026 State Department rule that rejects AI-edited or filter-touched photos outright. Plus how many photos each application needs and the file rules for online renewal uploads.

Updated June 28, 2026

Passport Photo Size: Pixels, Inches, Head Size, and 2x2 Layout

Passport photo size depends on the country. For U.S. passport photos, the size is 2 x 2 inches at 600 x 600 pixels for printing, and 600 x 600 to 1200 x 1200 pixels for online renewal upload. Includes head height in inches and pixels, print layout math, official online-renewal file rules, and common size mistakes that cause rejection.

Updated June 28, 2026

Passport Photo Sizes by Country 2026: US, UK, Schengen, India, China and More (Inches, mm, and Pixels)

Compare passport and visa photo dimensions worldwide — US 2 x 2 inch, UK and Schengen 35 x 45 mm, Canada 50 x 70 mm, India, China, Japan, Brazil, Mexico and more — in inches, millimeters, and pixels at 300 DPI, plus head-height ranges, background rules, and country-specific quirks.

Updated June 28, 2026

How to Take a Passport Photo at Home in 2026 (Avoid the AI-Edit Rejection)

A practical step-by-step guide to take a passport photo at home — setup, lighting, background, pose, cropping, printing, and the final check. Updated for the January 2026 State Department rule that rejects AI-edited or filter-touched passport photos outright.

Updated June 28, 2026

US Baby Passport Photo Requirements 2026: Complete Newborn and Infant Guide

The full U.S. baby passport photo checklist for 2026 — same 2 x 2 inch size as adults, with newborn eyes-open flexibility, no hands or supports in frame, age-specific at-home setups (newborn, older infant, toddler), the DS-11 appointment context, and how the January 2026 AI-edit rule applies to baby photos too.

Updated June 28, 2026

UK Passport Photo Requirements 2026: Size, Background, HMPO Digital Rules

UK passport photo rules for 2026 — the 35 x 45 mm printed size, plain light-grey or cream background (not pure white), HMPO digital upload specs, the no-glasses rule, the editing prohibition, and the common reasons photos are rejected.

Updated June 28, 2026

India Passport Photo Requirements 2026: Passport Seva, OCI, and 51 x 51 mm Specs

India passport and OCI photo requirements for 2026 — the 51 x 51 mm (2 x 2 inch) size, plain white background, when the photo is taken at the Passport Seva Kendra vs when you supply your own, OCI digital upload specs, glasses and editing rules, and how to avoid rejection.

Updated June 28, 2026

Canada Passport Photo Requirements 2026: 50 x 70 mm, the Photographer-Stamp Rule, and Why DIY Usually Fails

Canada passport photo rules for 2026 — the 50 x 70 mm size, plain white or light-coloured background, the commercial-photographer requirement with the back-of-photo stamp, face measurements (31–36 mm), and what a layout tool can and cannot do for a Canadian application.

Updated June 28, 2026

Schengen Visa Photo Requirements 2026: 35 x 45 mm Specs, ICAO Standards, and Rejection-Prevention Checklist

Schengen visa photo rules for 2026 — the 35 x 45 mm portrait size, the ICAO-aligned head proportions (32–36 mm), the light-grey background preference, the no-glasses rule, the prohibition on filters and AI editing, and a step-by-step checklist before you submit.

Updated June 28, 2026

Why HEIC Images Are Not Fully Compatible on the Web

HEIC is the default iPhone photo format and cuts file sizes in half — but it fails silently on most browsers, upload forms, and non-Apple devices. Here is why, when to convert HEIC to JPG, and when to convert HEIC to PNG instead.

Updated June 28, 2026

HEIC vs JPG: Which Format Should You Use for Sharing Photos?

HEIC stores photos at half the size of JPEG with better quality, but breaks on Windows, Android, and most web platforms. A direct comparison across file size, quality, compatibility, privacy, and when to convert iPhone photos HEIC to JPG before sharing.

Updated June 28, 2026

How to Remove GPS Location from iPhone Photos Before Sharing

Every iPhone photo with location services enabled contains exact GPS coordinates. This data is invisible in the image but travels with the file when you share it. Here is how to remove GPS data from photos before sending them.

Updated June 28, 2026

How to Make an Image Smaller Without Changing Its Dimensions

File size and pixel dimensions are two different things. If a form requires specific dimensions but a smaller file, you need compression — not resizing. This guide explains how to shrink image file size while keeping width and height unchanged.

Updated June 28, 2026

Remove Metadata from JPG Photos: Complete Privacy Checklist

Learn how to remove metadata from JPG photos before sharing. Stripping EXIF is only part of protecting your privacy: this checklist covers metadata, filenames, visible details inside the image, and special cases like HEIC, Live Photos, RAW and screenshots.

Updated June 28, 2026

How to Compress PNG or JPG to 100KB, 200KB, or 50KB

A practical 2026 guide to compressing a PNG or JPG to an exact size like 100KB, 200KB, or 50KB for government forms, visa and passport portals, job boards, and website uploads — which setting to change, the right format, and how to hit the target without making the photo blurry. Everything runs in your browser, so private documents never leave your device.

Updated June 28, 2026

Batch Resize Images Online: PNG and JPG Files

Batch resize images in a whole folder of PNG and JPG files at once — for a website, online store, email, or social media — without uploading anything to a server. This 2026 guide covers resizing by pixels, percentage, or platform preset, how to keep the aspect ratio so nothing stretches, when to resize versus compress, and why you should never scale images up.

Updated June 28, 2026

How to Convert AVIF to JPG or PNG: The 2026 Compatibility Guide

A practical guide to converting AVIF images to JPG or PNG in 2026 — why AVIF files won't open in Photoshop, email, print services, or older apps, when to pick JPG versus PNG, how to keep a transparent background, and how to convert privately in your browser without uploading anything.

Updated June 28, 2026

Mirror Image Online: Flip and Rotate Photos (No Uploads)

Mirror image online, flip a selfie, rotate a sideways photo, or straighten an image that is upside-down or facing the wrong way — without uploading anything to a server. This guide explains why phones save sideways photos, which fix solves which problem, how to make the correction permanent by baking it into the pixels, and how it affects quality.

Updated June 28, 2026

Passport Photo for Online Renewal vs Printed: 2026 Rules (Including the AI-Editing Reject)

Online U.S. passport renewal accepts a JPG, PNG, HEIC, or HEIF digital upload between 54 KB and 10 MB. Paper applications need a printed 2x2 inch photo. As of January 2026 the State Department rejects AI-edited photos in both — here is what counts as editing, what does not, and how to pick the right workflow.

Updated June 21, 2026

Best Passport Photo Tools in 2026: Free, Paid, and Government Reviewed (Honest Comparison)

Compare the four categories of U.S. passport photo tools — free browser tools, paid apps, pay-with-human-review services, and the State Department's own tool — against the January 2026 rule that rejects AI-edited photos outright. Includes where PhotoTools fits and where another category will serve you better.

Updated June 21, 2026

How to Prepare Passport Photos for Printing at Home 2026: Print Layout, DPI, and Quality

How to prepare and print passport photos at home in 2026 — standard sizes by country, the 300 DPI print rule, what filters and AI editing will get rejected, how to arrange multiple copies on a 4 x 6 inch sheet, and how to avoid print-scaling mistakes that change the physical dimensions.

Updated June 21, 2026

What Happens When You Upload a Photo to an Online Image Tool?

For server-based tools, your photo travels to a remote machine and may be logged, cached, or stored. For browser-based tools, none of that happens. Understanding the difference protects your privacy.

Updated June 21, 2026

AVIF vs WebP: Which One Should You Choose?

AVIF produces 30–50% smaller files than WebP but encodes much more slowly. Both have broad browser support in 2026. The right choice depends on your encoding pipeline, not just compression numbers.

Updated June 21, 2026

How to Resize Images for Email, Forms, and Upload Limits

Passport portals, job application forms, email attachments, and product upload systems all have different size limits. Here is what each context expects and how to meet those requirements without guessing.

Updated June 21, 2026

Why Your Image Looks Blurry After Uploading It Online

Platform re-compression, uploading a smaller image than the display slot, retina display mismatch, and heavy JPEG artifacts can all make a sharp photo look blurry after upload.

Updated June 21, 2026

Image DPI Explained: Does 72 DPI or 300 DPI Matter Online?

DPI only affects print output. Browsers ignore the DPI tag and display images based on pixel dimensions and CSS layout. Changing DPI without resampling changes nothing visible on screen.

Updated June 21, 2026

How to Add a Watermark Without Making Photos Look Cheap

Most watermarks fail in one direction: invisible or overwhelming. Placement, opacity, scale, and font choice all determine whether a watermark looks professional or amateur. A practical guide to each variable.

Updated June 21, 2026

When Should You Use GIF Instead of Video?

GIF is technically outclassed by video on every metric except universality. It wins in email, chat, and messaging apps where video autoplay is unsupported. A clear breakdown of when each format is correct.

Updated June 21, 2026

Why PNG Files Are So Large Compared to JPG

A PNG of the same photo can be five to ten times larger than a JPG. The reason is lossless versus lossy compression — and the difference matters more for photographs than for screenshots.

Updated June 20, 2026

How Image Compression Works: JPEG, PNG, WebP and AVIF Explained

A technical look at how the four major web image formats compress data — DCT blocks, lossless prediction, VP8 and AV1 — and why each produces the file sizes it does. For the decision itself, see our image format guide.

Updated June 20, 2026

Do Social Media Apps Remove EXIF Data Automatically?

Instagram and Facebook strip GPS metadata from public posts. WhatsApp re-encodes photos but not document attachments. Email strips nothing. Platform behavior is inconsistent — here is what each one actually does.

Updated June 20, 2026

How to Check If a Photo Contains Hidden Metadata

Photos often carry GPS coordinates, capture time, and camera model invisible in the image itself. This guide shows how to read EXIF data on Mac, Windows, iPhone, and in a browser without uploading the file.

Updated June 20, 2026

Why Your Website Images Are Slowing Down Your Page

Images are the largest assets on most web pages and the most common cause of slow load times. Wrong format, full camera resolution, skipped compression, missing lazy loading — this guide covers every cause.

Updated June 20, 2026

How to Compress Images for a Website Without Ruining Quality

The goal is to find the quality threshold where the image looks identical to the original at the size it will be displayed — then stop there. A practical guide to format selection, quality settings, and workflow.

Updated June 20, 2026

Best Image Format for Websites in 2026: JPG, WebP, or AVIF?

In 2026, WebP is the practical default for most web images, AVIF offers better compression for high-traffic sites, and JPEG remains valid for maximum compatibility. A direct format decision guide.

Updated June 20, 2026

Why WebP Is Smaller Than JPG and When Not to Use It

WebP is 25–35% smaller than JPEG at equivalent visual quality. The difference comes from a more efficient compression model — but WebP does not work in email clients, some native apps, or print workflows.

Updated June 20, 2026

How to Batch Watermark Photos Online with Text or a Logo

Add a text or logo watermark to a whole batch of photos at once — to protect them from theft and brand them with your name or URL — without uploading your masters to a server. This guide covers text vs logo watermarks, where to place them and at what opacity for each goal, and the honest limits of what a watermark can do.

Updated June 20, 2026