Best Free Alternatives to Stirling PDF in 2026

Nutrient PDF SDK is a developer toolkit for embedding viewing, editing, signing, redaction, and collaboration into apps.

Browser-based PDF toolkit for merging, splitting, compressing, converting, organizing, protecting, and signing files across desktop and mobile.

Privacy-conscious PDF toolkit for editing, filling, signing, converting, and securing files online or on desktop.

Soda PDF Online is a browser-based PDF toolset for editing, converting, merging, compressing, and signing documents quickly.

Tabula is a desktop tool for extracting data tables from text-based PDF files into CSV or spreadsheet formats.

Foxit PDF Editor Online brings browser-based PDF editing, annotation, forms, signing, and document management from Foxit's business-focused ecosystem.

Free PDF toolkit with browser-based tools for merging, splitting, compressing, converting, editing, signing, and securing documents.

Teaching and annotation platform for PDFs and classroom resources with accessibility, feedback, and interactive learning workflows.

Interactive flipbook and digital publication platform for brochures, catalogs, reports, training materials, and lead-generating business content.

Signaturely is an e-signature platform focused on getting documents signed quickly with legally binding online signatures.

Online PDF toolkit with 30+ tools for conversion, compression, editing, signing, OCR, and document workflows across devices.

Online PDF editor for filling, editing, signing, sending, and managing document workflows directly in the browser.