I wish they would do a bigger size kindle scribe. I read pdfs all day on my scribe, and often I wish the screen was bigger so the font size would be large.
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One way to fix the margins issue is to use the “Send to Kindle” feature, which converts PDFs to the Print Replica format and trims their margins in the process. Sideloaded PDFs actually appear with more margins (thus reduced font sizes) than books sent through Amazon’s servers.