TwoThink Image blog
Tutorials and techniques
How to Choose a Scale Factor and Algorithm When Enlarging an Image? Lanczos versus AI Upscaling
Local browser upscaling is neither lossless nor AI guessing at detail. Understand 2x/4x, Lanczos resampling and sharpening to choose between privacy and quality.
How to Build a Nine-Grid or Filmstrip Collage? Photo Collage Templates
A tour of TwoThink's collage templates: nine-grid, four-grid, filmstrip, horizontal and vertical strips, plus ID-photo A4 layouts, spacing, corner radius and output size — all done locally in your browser.
How to Turn a Screenshot Into Text? In-Browser OCR That Never Uploads Your Image
Upload-based OCR versus TwoThink's local image recognition: when to use each, how it differs from PDF text extraction, and how to handle language packs and proofreading.
Choosing ID Photo Sizes and Background Colours — 1-inch, 2-inch and A4 Layouts
Pixel specs for 1-inch, 2-inch, passport and social-security photos, white/blue/red and gradient-blue backdrops, plus the steps to cut out a photo locally in your browser and download an A4 layout.
The 14 Best Free Image Tools of 2026 (No Ads, No Uploads)
Compression, cropping, long images, AI background removal, ID photos, OCR, QR codes — a full roundup of TwoThink Image's browser tools: free, ad-free, and nothing leaves your device.
Free WiFi and Business-Card QR Codes: Choosing Colours, Logos, PNG and SVG
How to pick the error-correction level, use a centre logo, fill in the WiFi and vCard templates, and why PNG is the only download when a logo is present.
Don't Want to Upload ID Photos to remove.bg? Remove Backgrounds Locally in Your Browser
Upload-based cutout versus fully in-browser AI background removal: how to choose for privacy, speed and batch work, plus step-by-step instructions for TwoThink's local cutout.
Crop to 1:1 / 16:9 / 9:16 — Which Ratio Does Each Platform Want?
Avatars want 1:1, Bilibili covers want 16:9, vertical short-video covers want 9:16 — every platform has its own ratio, so here is how to choose a rectangular crop without cutting the wrong thing.
How to Combine Several Photos Into One for Your Feed? Long Image versus Grid
Nine travel shots, a group photo, several angles of a product — should it be a long image or a grid? Each format suits different content, and here is the difference.
Four Ways to Watermark an Image — Which One Looks the Cleanest?
Text watermarks, logo watermarks, tiling and a corner signature — which of the four common approaches fits which situation, and how do they compare on neatness and on discouraging copying?
How to Resize an Image Without Losing Sharpness? Three Parameters That Matter
Shrinking an image reduces the file size, but the wrong parameters make it blurry. Understand the long edge, the interpolation and the output format to balance sharpness against size.
How to Mosaic a Photo? Cover Faces, Plates and ID Numbers in Seconds
Masking faces, licence plates and ID numbers before you post a photo is basic hygiene. Here is how to redact private details fast by dragging over the regions you want to hide.
How to Stitch a Long Image for Xiaohongshu? Three Steps to a Note That Scrolls
Xiaohongshu notes often use vertical long images to show several steps or products. Here is how to go from picking images to exporting a long image made for scrolling.
How to Convert PNG / WebP to JPG Without Losing Quality? Three Key Parameters
A transparent PNG or a smaller WebP turned into a JPG: how do you control quality and file size? Three parameters decide the final result.
Image Too Big to Send on WeChat? Three Compression Methods Tested
WeChat limits how large an image can be, and camera originals run into tens of megabytes. I tried three compression approaches and compared file size, quality and privacy.
Before You Post, Your Photo Is Leaking Your Location
Photos taken on your phone carry EXIF data such as GPS coordinates and the device model. Before posting to WeChat or Xiaohongshu, find out which metadata travels with them.