Free Photo Comparison Apps for Local Files

To compare local photos without uploading them, choose Progress Photo: Before After for an Android timeline, digiKam for detailed desktop inspection, or FastStone Image Viewer for up to four pictures on Windows. The right choice depends on whether you want to revisit dated photos, examine fine detail, or choose among similar shots. PROGRESS is not affiliated with digiKam or FastStone.

What local-file comparison means here

The task is to open pictures already stored on your device and compare them without sending them to an online editor. Start by deciding what you need afterward: an on-screen inspection, a dated collection you can return to, or a combined image to save. Those are different jobs. A tool that helps you choose the sharpest shot may be a better fit than a photo journal, while a journal makes more sense for revisiting the same subject over time. Use the table to narrow the choice before importing a collection.

Progress: a local photo timeline on Android

Progress Photo: Before After lets you import gallery photos into a project and compare any two stored frames with a slider, side-by-side view, or fade. Import and comparison are free, and the free tier allows two active projects. You do not need an account or a photo upload for this workflow. Choose it when the dates and sequence matter, such as keeping a visual record of a room renovation. Save as image creates a comparison and opens Android’s share sheet; choose the destination yourself. Free comparison images include a watermark.

Progress’s limits for existing files

Progress stores imported working copies as JPEGs, with the longer edge limited to 2,400 pixels. Keep your original files separately if resolution, format, or original metadata matters. The comparison screen also lacks manual controls to align imported pictures, so it cannot correct a mismatched pair for you. These limits make it less suitable for examining original camera files or comparing tiny differences between edits. Its useful role here is organizing and comparing a dated series on your phone. Premium is an optional subscription that removes comparison watermarks and allows unlimited active projects; check the app for current terms and pricing.

digiKam: two-image inspection on a computer

Choose digiKam when you want a free, open-source desktop application for Windows, macOS, or Linux. Its official Light Table manual describes comparing two images, including supported RAW files. You can synchronize zooming and panning when both pictures have the same aspect ratio, which helps you examine corresponding areas. The sidebars can also show each image’s metadata. To begin, select your pictures and choose Place onto Light Table from the Item menu. digiKam’s About page says photos and settings stay locally; optional web-service export tools are separate. This is the stronger fit for detailed inspection of a desktop collection.

FastStone Image Viewer: compare up to four on Windows

Choose FastStone Image Viewer when you want to compare several candidates together on Windows. Its official feature page lists side-by-side comparison of up to four images, a magnifier, and EXIF metadata support. Its folder browser suits pictures already organized on your computer. FastStone’s Privacy Statement says its programs do not collect or transmit personal information. Its download page also offers a portable package that runs from a folder without installation. Image Viewer is free for personal and educational use; the official order page lists a one-time lifetime license for paid use. Check that page for the applicable license and current price if you plan to use it for work.

Check file support before committing

Try a representative file from your own collection before importing everything. FastStone’s feature page notes that HEIC support depends on Windows Imaging Component codecs on Windows 10 or 11. digiKam’s Light Table supports the formats the application can read, including RAW; check your actual camera files rather than assuming every file will behave alike. In Progress, JPEG capture dates are used when available; otherwise, the app falls back to the file’s modification date or the import time. Check the timeline after importing older or edited pictures, especially if their order is important to your comparison.

Try one complete comparison before paying

Use two non-sensitive local pictures for a small trial. Open or import them, compare the detail you care about, close the application, and reopen the files. If keeping photos off the network is essential, repeat the comparison while disconnected after setup. For an output you intend to keep, inspect the saved result as well as the preview: check framing, labels, and any watermark. For an inspection-only task, focus on whether you can examine the same area in both pictures. This gives you a concrete reason to keep a tool or try another before moving a whole collection.

Keep originals and verify restored photos

Keep independent copies before deleting anything from Progress. If a project deletion encounters a saving error, the project can remain visible even though its photos have been removed. A backup restore can also report success while including an unreadable photo. Open restored pictures and inspect them before relying on the backup or removing originals. A completed message alone is not enough. These limitations matter if Progress would otherwise become your only copy of a local collection; retain the gallery originals and a separate backup you have checked.

Keep the comparison local through the final step

Opening a local pair and sending the finished result are separate decisions. In Progress, inspect the destination offered by the share sheet before proceeding; saving a comparison does not require posting it publicly. In digiKam, leave optional web-service exports unused when you only need the Light Table. If your goal is simply to decide which image to keep, finish after the on-screen comparison. If you need a combined picture, confirm that your chosen tool produces the layout you want during the small trial. Do not assume a comparison viewer also provides your preferred export format.