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Step-by-step guides for PDF, JSON, e-invoicing and more — free in your browser.
45 guides
How to merge PDF files — free guide
Step-by-step guide to combine PDFs in your browser without upload.
4 steps · PDF Studio
How to compress PDF — reduce file size
Compress PDF files locally to fit email limits — browser guide.
4 steps · PDF Studio
How to format JSON online
Pretty-print and validate JSON locally in your browser.
4 steps · Code Studio
How to create XRechnung — DE guide
Create and validate XRechnung invoices for German public buyers.
4 steps · Document Studio
E-invoice full workflow — EN 16931 to XRechnung submit
Create, validate and export German e-invoices with XRechnung and ZUGFeRD checks.
5 steps · Document Studio
How to optimize images for the web
Resize, compress and convert images for fast pages — HEIC, PNG, JPEG and OG cards.
5 steps · Image Studio
Workflows and how-tos grouped by the Tentaco studio they use.
PDF Studio
7 guides
Complete PDF workflow — scan to signed export
End-to-end guide: scan images, OCR, merge, compress, watermark and sign PDFs locally in Tentaco.
5 steps · PDF Studio
How to add a PDF watermark
Overlay DRAFT or CONFIDENTIAL text on every PDF page.
4 steps · PDF Studio
How to compress a PDF without uploading
Step-by-step guide to shrink PDFs in Tentaco PDF Studio for email limits while keeping files on your device.
4 steps · PDF Studio
How to OCR a scanned PDF
Extract searchable text from scanned documents locally.
4 steps · PDF Studio
How to sign a PDF — free guide
Add a visual signature to PDF documents in your browser.
4 steps · PDF Studio
Job application PDF — tips (DE)
Merge, compress and sign application PDFs locally before sending.
4 steps · PDF Studio
Local-first browser tools — privacy workflow
A practical guide to Tentaco tools that process files and text in your browser instead of uploading to cloud converters.
4 steps · PDF Studio
Web & SEO Studio
5 guides
How to build UTM links for social campaigns
Create consistent UTM-tagged URLs for analytics — source, medium, campaign naming best practices.
5 steps · Web & SEO Studio
How to generate hreflang alternate tags
Build reciprocal hreflang and x-default link tags from locale + URL lists before publishing multilingual pages.
5 steps · Web & SEO Studio
How to validate JSON-LD schema markup
Validate schema.org JSON-LD before publishing — catch type errors and missing required fields.
5 steps · Web & SEO Studio
Open Graph preview guide — fix social cards
Check title, description and image meta before launch, then clear stale platform caches after you fix tags.
4 steps · Web & SEO Studio
Social media kit workflow — sizes, UTM and OG images
Prepare campaign assets: resize images, build UTM links and OG preview cards.
5 steps · Web & SEO Studio
Security Studio
4 guides
How to decode a JWT safely in the browser
Inspect JWT header and payload locally, understand claims, and avoid pasting production tokens into public debuggers.
4 steps · Security Studio
JWT decode workflow — inspect tokens safely
Step-by-step guide to decode and validate JWT header and payload locally without sending tokens to a server.
5 steps · Security Studio
Password generator guide — strong random secrets
Create cryptographically random passwords in the browser, tune character sets, and store results in a password manager.
4 steps · Security Studio
Password security audit — generate, test and hash
Audit password policy with generators, strength checks and bcrypt dev hashes.
5 steps · Security Studio
Code Studio
3 guides
Regex tester guide — debug patterns live
Build and refine regular expressions against real samples in the browser, with capture groups and JavaScript flavor notes.
4 steps · Code Studio
Regex testing guide — patterns before production
Build, test and document regex patterns with local highlighter and replace preview.
5 steps · Code Studio
Schema validation guide — JSON Schema and OpenAPI
Validate JSON payloads against schemas and lint OpenAPI specs before release.
5 steps · Code Studio
Audio Studio
2 guides
Automation Studio
2 guides
How to build a cron schedule — readable expressions
Create and validate cron expressions for Linux, GitHub Actions and Kubernetes CronJobs.
5 steps · Automation Studio
How to generate a .gitignore for your stack
Create project-specific .gitignore files for Node, Python, Rust and monorepos — avoid committing secrets and build artifacts.
5 steps · Automation Studio
Data Studio
2 guides
Database export pipeline — JSON flatten and CSV prep
Flatten nested API JSON, convert CSV and validate before warehouse import.
5 steps · Data Studio
How to flatten nested JSON for databases
Flatten nested JSON objects into dot-notation keys for SQL imports, CSV exports and analytics.
5 steps · Data Studio
Document Studio
2 guides
Image Studio
2 guides
Compress images for the web — Tentaco guide
Reduce JPG, PNG and WebP size in the browser, balance quality, and prepare assets for CMS or chat upload limits.
4 steps · Image Studio
Convert HEIC to JPG — iPhone photos on any PC
Convert Apple HEIC photos to JPEG in your browser for Windows apps, email, and CMS uploads without iCloud-only steps.
4 steps · Image Studio
Text Studio
2 guides
Video Studio
2 guides
3D & CAD Light
1 guide
API Studio
1 guide
Calculator Studio
1 guide
Converter Studio
1 guide
E-Invoice Studio
1 guide
Map & Geo Studio
1 guide