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Everything you need to embed e-signatures

Firma.dev gives you a complete REST API, embeddable editors, customer workspaces, and compliance tooling. All of it pay-as-you-go at €0.029 per envelope.

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4.8-star rating on g2.com

Everything you need to embed e-signatures

Firma.dev gives you a complete REST API, embeddable editors, customer workspaces, and compliance tooling. All of it pay-as-you-go at €0.029 per envelope.

Get your API key now

View API Docs

4.8-star rating on g2.com

Features: API & Integration

Document Signing API, Simplified

A REST API built for developers who need document signing that works. Simple authentication, clear documentation, and integration that takes hours, not weeks.

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E-Signature API

A complete REST API for creating templates, sending signing requests, and tracking document status. Swagger/OpenAPI docs, pre-built UI components, and webhook events included.

E-Signature API

A complete REST API for creating templates, sending signing requests, and tracking document status. Swagger/OpenAPI docs, pre-built UI components, and webhook events included.

Embeddable Template Editor

Let your users design document templates from inside your app. Drop in an iframe, generate a short-lived JWT, and the editor loads with your branding. No redirects, no separate accounts.

Embeddable Template Editor

Let your users design document templates from inside your app. Drop in an iframe, generate a short-lived JWT, and the editor loads with your branding. No redirects, no separate accounts.

Embeddable Signing Request Editor

Give users control over signing request setup without leaving your interface. Recipients, field placement, reminders, and validation rules are all configurable through the embedded editor.

Embeddable Signing Request Editor

Give users control over signing request setup without leaving your interface. Recipients, field placement, reminders, and validation rules are all configurable through the embedded editor.

Embeddable Signing

Signers complete the entire signing flow inside your product. No redirects to a third-party domain, no extra accounts to create. The experience is fully white-labeled and responsive across devices.

Embeddable Signing

Signers complete the entire signing flow inside your product. No redirects to a third-party domain, no extra accounts to create. The experience is fully white-labeled and responsive across devices.

Webhooks

Get POST notifications for every signing event: created, sent, viewed, signed, completed, expired, declined. Register a URL per workspace and react to events in real time instead of polling.

Webhooks

Get POST notifications for every signing event: created, sent, viewed, signed, completed, expired, declined. Register a URL per workspace and react to events in real time instead of polling.

Features: Customer Management

Customer Workspaces

Private, partitioned spaces for each of your customers. Templates, documents, branding, and envelope usage are isolated per workspace. Your operators still work from a single API. Clean multi-customer separation without complicated tenant setups.

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Features: Signing Experience

Total Control Over the Signer Experience

Every detail of the signing flow is configurable, from the language the signer sees to the fields they interact with.

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Multi-Language Signatures

The signing interface supports 7 languages: English, Spanish, French, Portuguese, Italian, German, and Greek. Language cascades from signing request to workspace to company, so you set defaults once and override where needed.

Multi-Language Signatures

Multi-Script Signature Support

Firma.dev auto-detects the signer's writing system and presents matching signature fonts. Latin, Cyrillic, Greek, Japanese, and Korean are all supported with curated typefaces. Zero developer configuration.

Multi-Script Signature Support

Signer Identity Verification

Require email OTP verification before a signer can view or sign a document. Six-digit codes with 10-minute expiry, configurable at the workspace or individual signing request level.

Signer Identity Verification

Require email OTP verification before a signer can view or sign a document. Six-digit codes with 10-minute expiry, configurable at the workspace or individual signing request level.

Hand-Drawn Signatures

Signers can draw their signature using a mouse, trackpad, or touchscreen alongside the typed signature option. For workflows that need it, you can require hand-drawn only via the API.

File Upload Fields

Collect supporting documents during the signing flow. Signers can upload images or PDFs alongside their signature. Validated by magic bytes (not file extension), 10MB limit, three file type modes.

File Upload Fields

Collect supporting documents during the signing flow. Signers can upload images or PDFs alongside their signature. Validated by magic bytes (not file extension), 10MB limit, three file type modes.

Field Background Colors

Set custom background colors on any field via a single API property. Color-code fields by signer, highlight required fields, or group related inputs visually. Works on all field types.

Field Background Colors

Set custom background colors on any field via a single API property. Color-code fields by signer, highlight required fields, or group related inputs visually. Works on all field types.

Signature Verification Frames

Each signature in a completed PDF includes a visual identifier showing a truncated signer ID. Useful for multi-signer documents where you need to see who signed where at a glance. Controllable at company, workspace, or request level.

Signature Verification Frames

Features: Document Management

Templates In. Signed PDFs Out.

Flexible document handling from template creation through to the final signed PDF.

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Template Document Replacement

Swap the PDF on an existing template without losing field placements, signer assignments, or settings. Supports PDF and DOCX uploads with automatic conversion. Page count and dimension validation keeps everything aligned.

Template Document Replacement

DOCX Support

Upload Word documents directly to any document endpoint. [Firma.dev](http://Firma.dev) converts them to PDF server-side, automatically. Your existing PDF integrations keep working. No client-side conversion libraries needed.

DOCX Support

Audit Trail

Every action in the signing lifecycle is logged with timestamps, actor details, source classification, and IP addresses. Browse the timeline in the admin panel or query it via API. Exportable as a standalone document or merged with the signed certificate PDF.

Audit Trail

Features: Branding & Localization

Branding and Localization, Built In

Make the signing experience look and feel like your product, in your customers' language.

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White Labeling

Customize the signing experience, embedded editors, and email notifications with your own branding. Your customers never see [Firma.dev](http://Firma.dev)'s name unless you want them to. Combine with custom email domains for a completley branded experience.

White Labeling

Custom Email Templates

Edit the subject and body of every notification Firma.dev sends on your behalf. Five template types: signing invite, next signer notification, expired, cancelled, and declined. Dynamic variables for signer name, document name, signing link, and more.

Localization

7 supported interface languages with a cascading configuration model. Set a default language per workspace that controls system emails, or override at the signing request level. URL-based language overrides and per-user language persistence are also supported.

Localization

Features: Security & Compliance

EU-Hosted & Compliance Ready

Designed to support the compliance frameworks your customers care about, with EU-hosted infrastructure.

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ESIGN Act & UETA

Firma.dev supports compliance with the ESIGN Act and UETA for legally binding electronic signatures in the United States. Every signature includes a complete audit trail with timestamps, IP addresses, and consent records.

eIDAS (SES & AdES)

Supports Simple Electronic Signatures and Advanced Electronic Signatures under the eIDAS regulation. Designed for European businesses that need legally valid cross-border signatures.

GDPR & EU Data Residency

Hosted on AWS in the EU (Paris region) with CloudFront distribution from Stockholm. Your data stays in Europe. Designed to support GDPR requirements for data processing and storage.

SOC 2, ISO 27001 & HIPAA

Firma.dev aligns with SOC 2 and ISO 27001 security frameworks, with controls designed to support HIPAA requirements for protected health information. Encryption in transit and at rest on all data.

€0.029 per envelope. That's it.

No monthly fees, no contracts, no seat-based pricing. Your first 25 envelopes are free.

Get your API key now

€0.029 per envelope. That's it.

No monthly fees, no contracts, no seat-based pricing. Your first 25 envelopes are free.

Get your API key now

€0.029 per envelope. That's it.

No monthly fees, no contracts, no seat-based pricing. Your first 25 envelopes are free.

Get your API key now