BioABC
Biology · Molecular biology · Bioinformatics

Free online biology andbioinformatics tools

Analyze DNA, RNA, and protein sequences, inspect biological files, and perform everyday laboratory calculations—directly in your browser.

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Your data stays in your browser whenever possible.

01 · Available nowBrowse all tools →

Popular tools

Four utilities are live today. Each one runs in the page, takes pasted sequence or a dropped file, and returns numbers you can copy.

Calculators02

GC Content Calculator

Calculate GC percentage, AT percentage, sequence length, and base composition.

Open tool →local
02 · Quick-use workspace

Paste a sequence, get an answer

The same engine the tool pages use. Nothing is uploaded — the sequence below is processed by this page.

Workspace — quick sequence operationsRuns in browserv0.1
Operation
Sequence input348 characters
or drop a .fasta / .txt file
Resultreverse complement
Length
300
GC
56.0%
Strand
5'→3'
NGGGCCTCTTCGCTATTACGCCAGCTGGCGAAAGGGGGATGTGCTGCAAGGCGATTAAGT TGGGTAACGCCAGGGTTTTCCCAGTCACGACGTTGTAAAACGACGGCCAGTGAATTCGAG CTCGGTACCCGGGGATCCTCTAGAGTCGACCTGCAGGTCGACGGTTAAACCTGGACCATG GCCTAAGCTTCAAGGTACCGATTGCCAAGCTNAGGCCTAAGGATCCGGTTAATGCCACGT TACGCTCAAGGTCAGCCTTGGAACCTGATCGGTACCGCTAACTGTTCCAGAGGGCGCCAT
03 · Latest

What changed

Tools are announced when they work, not when they are planned. Everything below is live on the site today.

Changelog — bioabc.comUpdated 2026-07-28
2026-07-28New toolFASTA Viewer & ValidatorOpen a FASTA file, check its records and headers, and reformat line widths. Multi-record files are handled in one pass.
2026-07-14UpdateGC calculator now reads IUPAC codesAmbiguity codes are counted separately and excluded from the GC denominator by default — the option is yours to change.
2026-06-30New toolDNA / RNA / Protein TranslatorStandard genetic code, six reading frames, and DNA to RNA conversion in the same page.
2026-06-11NoteBioABC v0.1 is liveFour tools, no accounts, and every calculation running in your own browser.
/changelog
04 · Explore by category

The catalog

Every category has its own index page. Tools are added to the categories they belong in — nothing is filed twice to look fuller.

05 · Biological file formats

Open and understand biological files

Preview, validate, and learn about common life-science data formats without installing specialized desktop software. FASTA has a viewer today; the rest begin as format reference pages.

Instrument-specific formats are a long-term goal, not a current claim. Support is announced per format, with a validator and a documented parser, when it ships.

06 · Why BioABC
BioABC — operating notesRev 0.1Sheet 01 of 01
01No installationEvery tool is a web page. Nothing to download, compile, or keep updated.
02No account requiredNo sign-up, no paywall, no usage counter. Open the tool and use it.
03Browser-based processingAll four v0.1 tools compute locally. Sequences you paste are not sent to a server.
04Clear resultsCopyable numbers, stated units, and the method written next to the output.
05Built for real workflowsIUPAC ambiguity codes, FASTA headers, soft-masked bases, and large pastes are handled by default.