SeqStudio — Real Editable Sequence & Plasmid Editor
Type or paste a sequence and edit it directly — every feature remaps live as you insert, delete, or replace bases, with undo/redo and GenBank import/export.
🌐 Editing, undo/redo, and GenBank import/export all happen locally in your browser — nothing is sent anywhere for those. Only clicking "Auto-annotate" sends the sequence to SeqBench's own server to detect features.
Unlike this site's other plasmid tools, which only display a sequence you paste in, SeqStudio is genuinely editable: type directly into the sequence, and every feature's coordinates update live as bases are inserted, deleted, or replaced — including a feature that wraps a circular plasmid's origin. An edit that would partially delete a feature is never applied silently; you're asked to trim the feature to what survives or delete it outright. A bounded undo/redo history coalesces rapid typing into single steps, auto-annotation reuses the same signature library as the Plasmid Annotator, and you can import or export a real GenBank file.
0bp · every keystroke remaps every feature live — the browser's own undo is not wired to this editor's undo/redo below.
How to use the SeqStudio tool
- 1Load the example or paste/type a DNA sequence, and check "Circular" if it's a plasmid.
- 2Edit directly in the textarea — click Auto-annotate to detect common features, or add your own — and watch the map update as you type.
- 3If an edit partially overlaps a feature, choose "trim" or "delete" for it in the banner that appears before the edit is applied.
- 4Export the result as a GenBank file, or copy a share link that restores the exact sequence and features.
Frequently asked questions
How is this different from the Plasmid Annotator or Plasmid Viewer?
Those two tools render a sequence you paste in — read-only. SeqStudio is a real editor: the sequence itself is a live textarea, and every keystroke (insert, delete, or a selection typed over) recomputes each feature's coordinates against that specific edit, including features that wrap a circular plasmid's origin.
What happens if my edit would partially delete a feature?
It's never applied silently. If a deletion would consume only one boundary of a feature (its start or its end, not both), the edit is held and a banner asks you to choose, per affected feature: "trim to remaining sequence" (keep whatever part of the feature survives) or "delete" it outright. A deletion that consumes a feature ENTIRELY is auto-removed with a toast — undo brings it straight back.
How does undo/redo work?
A bounded history (up to 150 steps) of full sequence+feature snapshots, not a diff log — rapid typing is coalesced into one undo step after a short pause, the same way most text editors group keystrokes. The browser's own native text-undo isn't wired to this editor's undo/redo buttons.
What's explicitly not supported yet?
A live restriction-digest overlay while editing, and export to SnapGene's proprietary .dna format (writing that undocumented binary is out of scope). Reading a SnapGene .dna file IS supported on import (via a reverse-engineered parser), alongside GenBank (including Benchling's GenBank exports); GenBank import/export round-trips fully, including a feature that wraps the circular origin.
Related tools
Per-base quality, GC and length distributions, duplication levels, overrepresented sequences and adapter content, each with a warn/fail verdict.
Align several DNA or protein sequences and view a colored alignment with a consensus.
Predict restriction fragments and see the simulated agarose gel with a ladder.