Switching gallery plugins sounds like a weekend of dread, and for some plugins that dread is justified — but for others it is overblown. The difference comes down to one thing: how portable your data is in the plugin you are leaving. A plugin that stores galleries in a clean, exportable format is a gentle move; one that buries them in custom database tables with metadata stored separately is a genuine project. Knowing which situation you are in before you start is what turns migration from a leap of faith into a managed task.
This walks through why people migrate, the portability spectrum across the main plugins, the gotchas (especially NextGEN’s), and the safe migration plan. It sits under our best gallery plugins guide.
Why people migrate
Three reasons dominate. Performance: a heavy gallery plugin is dragging down Core Web Vitals and the owner wants a lighter one. Features: they have outgrown their current plugin and need layouts, proofing, e-commerce, or a better lightbox it cannot provide. Lock-in fatigue: they are tired of a plugin’s pricing, add-on model, or direction and want out. All three are legitimate, and the good news is that switching is more achievable than the dread suggests — provided you understand the portability of what you are leaving.
The portability spectrum
Plugins differ enormously in how easy they are to leave, and this is the single biggest factor in how hard your migration will be.
NextGEN — the hard end. NextGEN stores galleries in its own custom database tables, separate from the normal WordPress media structure, and has no built-in migration-out tooling. Worse, image tags are stored separately (in the WordPress terms tables) and are easily lost in a migration unless handled deliberately. So a NextGEN exit is the most involved of the common cases — the data is there, but extracting it cleanly, with tags and metadata intact, takes care.
Envira — the easier end. Envira stores galleries as custom post types and offers JSON export, which makes the data far more portable. Its galleries can be exported and re-imported with much less friction than NextGEN’s, so an Envira move is closer to a routine task than a project.
Modula, FooGallery, and others sit in between, generally more portable than NextGEN. The principle holds across all of them: check how your current plugin stores galleries before you start, because that determines whether you are looking at an afternoon or a weekend.
The NextGEN gotchas specifically
Because NextGEN is the hardest and most common migration, its specific traps are worth naming. Tags stored separately: NextGEN keeps image tags in the WordPress terms tables, so a migration that only moves the gallery records loses the tags unless you export them separately — and for a tag-organised archive, losing the tags is losing the organisation. Custom tables: the galleries are not in the standard media library structure, so generic import tools may not find them. “No gallery found” and cache errors: NextGEN migrations commonly throw these, usually fixed by clearing caches, but they are alarming mid-migration if you are not expecting them. None of these is insurmountable, but going in blind to them is how a NextGEN migration becomes the weekend of dread; going in aware is how it becomes manageable.
Do this now. Before any migration, do two things. First, identify how your current plugin stores galleries (NextGEN = custom tables, hard; Envira = custom post type with JSON export, easier) so you know what you are dealing with. Second — and this is non-negotiable — take a full backup of your site (files and database). Migration touches a lot of data; a backup means a failed migration is an inconvenience, not a catastrophe. Never migrate galleries without a backup you have confirmed works.
The migration plan
- Back up the full site (files + database) and confirm the backup is restorable.
- Audit what you have — how many galleries, what metadata (captions, alt text, tags, EXIF) matters, what must survive.
- Test on staging first if you can — run the migration on a copy before touching the live site.
- Migrate using a migration assistant or export/import, ideally with a dry-run/preview before committing.
- Verify — check galleries, captions, alt text, tags, and that images display correctly across devices.
- Redirect and clean up — set up redirects if URLs changed, then remove the old plugin once you are confident.
The “test on staging” and “dry-run before commit” steps are what separate a calm migration from a stressful one. They let you see exactly what will happen — including whether tags and metadata survive — before anything on the live site changes.
Preserving what gets lost
The things most often lost in a gallery migration are the metadata, not the images: captions, alt text, tags, and EXIF. The images usually survive (they are files); the connective tissue that made them organised and SEO-optimised is what falls through the cracks, especially from NextGEN where tags live separately. So the verification step should specifically check these, not just “do the images show?”. Losing your alt text in a migration silently undoes your image SEO (see image SEO mistakes); losing tags undoes your gallery’s organisation. A migration tool that explicitly preserves albums, captions, and EXIF is worth choosing for exactly this reason.
The easy path
The friction in all of this is why a built-in migration assistant matters: instead of manual export/import and hoping the metadata survives, a purpose-built importer reads the old plugin’s data and recreates the galleries with their captions, EXIF, and structure preserved. FotoGrids includes a free migration assistant that imports from NextGEN, Envira, Modula, and FooGallery, preserving albums, captions, and EXIF where possible, with a dry-run mode so you can preview exactly what will be created before committing. That dry-run is the migration plan’s “test before commit” step built into the tool — it turns the NextGEN weekend-of-dread case, specifically, into something you can preview and trust. Whatever tool you use, the principles hold: back up, dry-run, verify the metadata, then clean up.
Key takeaways
- Migration difficulty depends on portability: NextGEN (custom tables, no export) is hard; Envira (JSON export) is easier.
- NextGEN’s specific traps: tags stored separately (easily lost), custom tables, cache errors.
- Always back up first; test on staging and dry-run before committing to the live site.
- What gets lost is the metadata (captions, alt text, tags) — verify those, not just the images.
How hard is it to migrate from NextGEN Gallery?
It is the hardest of the common cases, because NextGEN stores galleries in custom database tables with no built-in export, and keeps image tags separately so they are easily lost. The data is recoverable but extracting it cleanly with tags and metadata intact takes care. A purpose-built migration assistant with a dry-run mode makes it far more manageable.
Will I lose my galleries if I switch plugins?
Usually not the images, but you can lose the metadata — captions, alt text, tags, EXIF — which is the connective tissue that made them organised and SEO-optimised. Always back up first, test on staging, use a dry-run, and specifically verify the metadata survived, not just that the images display. A migration tool that explicitly preserves captions and EXIF reduces the risk.
What is the safe way to migrate gallery plugins?
Back up the full site and confirm the backup restores; audit what metadata matters; test the migration on a staging copy first; migrate with a dry-run/preview before committing; verify galleries, captions, alt text, and tags across devices; then set up any needed redirects and remove the old plugin. The backup and dry-run steps are what make it calm rather than stressful.