The contact sheet is built for selection work
Unlike a presentation collage, the filename label is part of the design so you can identify the original file after spotting a useful thumbnail.
Free browser tool
Create a labeled thumbnail contact sheet from multiple images.
Create a PNG contact sheet from multiple images, using 220px square thumbnail cells with the source filename printed below each thumbnail.
contact-sheet.png.Long filenames are truncated to their first 30 characters. If the distinguishing number is at the end of a long filename, the sheet can make two files look ambiguously labeled.
Unlike a presentation collage, the filename label is part of the design so you can identify the original file after spotting a useful thumbnail.
A 12-column sheet fits many images across the page but each source still occupies a 220px cell in the output. On-screen preview scaling can make fine differences harder to judge.
Portrait and landscape images are scaled to fit and centered rather than stretched. White background remains around the unused part of the square.
The tool does not sort by EXIF time or filename. Confirm the ordering when the contact sheet is meant to represent a sequence.