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.

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

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

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

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

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

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

Canva PDF Editor lets you edit, annotate, sign, and restyle PDF documents inside Canva's visual design workspace.

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

Xodo PDF is a cross-platform document suite for editing, annotating, converting, signing, and managing PDFs on web, desktop, and mobile.

Adobe Acrobat Online brings PDF creation, conversion, editing, filling, signing, sharing, and AI-assisted document work to the browser.