The Blinkimg blog
Guides, format comparisons and engineering notes, every figure measured on the same engine you use.
Recent articles
- SizesYouTube, Thumbnails, ShortsHow to make a YouTube thumbnail: we made 18 and measuredTo make a YouTube thumbnail, crop an image to 16:9, add two or three large words, save it as a JPG and upload it under Thumbnail in YouTube Studio. Your account must be verified first. We made 18 thumbnails this way and measured every file and headline.Sahadat Husain
- FormatsPDF, JPG, ConvertHow to save a PDF as a JPEG on Mac, Windows and iPhoneTo save a PDF as a JPEG on a Mac, open it in Preview, choose File, then Export, and pick JPEG. On Windows 11, take a snip with Windows logo key + Shift + S. Acrobat and an iPhone shortcut export every page at once. Pick 150 DPI for screens and 300 DPI for print.Sahadat Husain
- GuidesGmail, Attachments, Google DriveGmail attachment size limit: we tested where 25 MB endsThe Gmail attachment size limit is 25 MB for a personal account, across all files in one email. We tested it with real photos: Gmail counted the files, not the email, and its 25 MB means 26,214,400 bytes.Sahadat Husain
- GuidesEmail, Compress, GmailHow to compress photos for email: 20 images, measuredTo compress photos for email, resize them to about 1920 pixels on the long side and save them as JPG. We tried it on 20 real images: the email went from 130.3 MB to 8.2 MB, under every provider's limit.Sahadat Husain
- GuidesPNG, Compress, File sizeHow to make a PNG file smaller: 5 fixes, measuredTo make a PNG file smaller, cut it to 256 colours, shrink its pixels, or save a photo as JPG, WebP or AVIF. Which fix wins depends on what is in it: we measured all five on a photo, a screenshot and a cutout.Sahadat Husain
- GuidesResolution, Pixels, PPIHow to change the resolution of a picture (any device)To change the resolution of a picture, resize its width and height in pixels: Paint on Windows, Preview on a Mac or iPhone, Gallery on Samsung, or an image resizer in any browser. Lowering it is safe. Raising it adds pixels, not detail.Sahadat Husain
- GuidesPixel, Resolution, MegapixelWhat is a pixel? A real photo, measured pixel by pixelA pixel is the smallest dot of colour in a digital image. It is one square of a grid, stored as three numbers for red, green and blue. We read one pixel of a real photo, saved its 13,809,848 pixels six ways and counted what a pixel costs in bytes and on a screen.Sahadat Husain
- SizesUS passport, Passport photo, WalgreensDoes Walgreens do passport photos? Where to get oneYes. Walgreens takes passport photos at most of its stores, with no appointment: two 2 × 2 prints for $16.99 and a free copy by email. Here is what CVS, the Post Office, Walmart, FedEx Office, The UPS Store and AAA charge, each read from its own page on 6 October 2026, and the 3-cent route you print yourself.Sahadat Husain
- GuidesGoogle Images, Download, WebP to JPGHow to download an image from Google, full size and as a JPGTo download an image from Google, click the picture, then right-click the large preview and choose Save image as. On a phone, touch and hold the preview instead. Save the preview, not the grid thumbnail, and check the extension: a .webp file converts to a real JPG.Sahadat Husain
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